diff --git a/libdino/src/plugin/registry.vala b/libdino/src/plugin/registry.vala
index 9c211a6d..73c28a02 100644
--- a/libdino/src/plugin/registry.vala
+++ b/libdino/src/plugin/registry.vala
@@ -11,9 +11,9 @@ public class Registry {
     internal Gee.List<NotificationPopulator> notification_populators = new ArrayList<NotificationPopulator>();
     internal Gee.Collection<ConversationTitlebarEntry> conversation_titlebar_entries = new Gee.TreeSet<ConversationTitlebarEntry>((a, b) => {
         if (a.order < b.order) {
-            return -1;
-        } else if (a.order > b.order) {
             return 1;
+        } else if (a.order > b.order) {
+            return -1;
         } else {
             return 0;
         }
diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 0a21d1f0..a0996093 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -32,6 +32,7 @@ set(RESOURCE_LIST
     chat_input.ui
     contact_details_dialog.ui
     conversation_list_titlebar.ui
+    conversation_list_titlebar_csd.ui
     global_search.ui
     conversation_selector/view.ui
     conversation_selector/chat_row_tooltip.ui
@@ -100,6 +101,7 @@ SOURCES
     src/ui/contact_details/dialog.vala
     src/ui/contact_details/muc_config_form_provider.vala
     src/ui/conversation_list_titlebar.vala
+    src/ui/conversation_list_titlebar_csd.vala
     src/ui/global_search.vala
     src/ui/conversation_selector/conversation_row.vala
     src/ui/conversation_selector/list.vala
@@ -115,6 +117,7 @@ SOURCES
     src/ui/conversation_titlebar/occupants_entry.vala
     src/ui/conversation_titlebar/search_entry.vala
     src/ui/conversation_titlebar/view.vala
+    src/ui/conversation_titlebar/view_csd.vala
     src/ui/manage_accounts/account_row.vala
     src/ui/manage_accounts/add_account_dialog.vala
     src/ui/manage_accounts/dialog.vala
@@ -124,6 +127,7 @@ SOURCES
     src/ui/occupant_menu/view.vala
     src/ui/settings_dialog.vala
     src/ui/unified_window.vala
+    src/ui/unified_window_controller.vala
     src/ui/util/accounts_combo_box.vala
     src/ui/util/data_forms.vala
     src/ui/util/helper.vala
diff --git a/main/data/conversation_list_titlebar.ui b/main/data/conversation_list_titlebar.ui
index 6c5d2d0a..bc490e4b 100644
--- a/main/data/conversation_list_titlebar.ui
+++ b/main/data/conversation_list_titlebar.ui
@@ -1,26 +1,49 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-    <template class="DinoUiConversationListTitlebar" parent="GtkHeaderBar">
+    <template class="DinoUiConversationListTitlebar" parent="GtkBox">
         <property name="hexpand">False</property>
-        <property name="show_close_button">True</property>
         <property name="visible">True</property>
         <style>
-            <class name="dino-left"/>
+            <class name="dino-header-left"/>
         </style>
         <child>
-            <object class="GtkMenuButton" id="add_button">
+            <object class="GtkBox">
+                <property name="margin">5</property>
+                <property name="hexpand">True</property>
                 <property name="visible">True</property>
                 <child>
-                    <object class="GtkImage">
+                    <object class="GtkMenuButton" id="add_button">
+                        <property name="relief">none</property>
                         <property name="visible">True</property>
-                        <property name="icon-name">list-add-symbolic</property>
-                        <property name="icon-size">1</property>
+                        <child>
+                            <object class="GtkImage">
+                                <property name="visible">True</property>
+                                <property name="icon-name">list-add-symbolic</property>
+                                <property name="icon-size">1</property>
+                            </object>
+                        </child>
                     </object>
+                    <packing>
+                        <property name="pack_type">start</property>
+                    </packing>
+                </child>
+                <child>
+                    <object class="GtkMenuButton" id="menu_button">
+                        <property name="relief">none</property>
+                        <property name="visible">True</property>
+                        <child>
+                            <object class="GtkImage">
+                                <property name="visible">True</property>
+                                <property name="icon-name">open-menu-symbolic</property>
+                                <property name="icon-size">1</property>
+                            </object>
+                        </child>
+                    </object>
+                    <packing>
+                        <property name="pack_type">end</property>
+                    </packing>
                 </child>
             </object>
-            <packing>
-                <property name="pack_type">start</property>
-            </packing>
         </child>
     </template>
 </interface>
diff --git a/main/data/conversation_list_titlebar_csd.ui b/main/data/conversation_list_titlebar_csd.ui
new file mode 100644
index 00000000..b87cd893
--- /dev/null
+++ b/main/data/conversation_list_titlebar_csd.ui
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+    <template class="DinoUiConversationListTitlebarCsd" parent="GtkHeaderBar">
+        <property name="hexpand">False</property>
+        <property name="show_close_button">True</property>
+        <property name="visible">True</property>
+        <style>
+            <class name="dino-left"/>
+        </style>
+        <child>
+            <object class="GtkMenuButton" id="add_button">
+                <property name="visible">True</property>
+                <child>
+                    <object class="GtkImage">
+                        <property name="visible">True</property>
+                        <property name="icon-name">list-add-symbolic</property>
+                        <property name="icon-size">1</property>
+                    </object>
+                </child>
+            </object>
+            <packing>
+                <property name="pack_type">start</property>
+            </packing>
+        </child>
+        <child>
+            <object class="GtkMenuButton" id="menu_button">
+                <property name="relief">none</property>
+                <property name="valign">center</property>
+                <property name="visible">True</property>
+                <child>
+                    <object class="GtkImage">
+                        <property name="visible">True</property>
+                        <property name="icon-name">open-menu-symbolic</property>
+                        <property name="icon-size">1</property>
+                    </object>
+                </child>
+            </object>
+            <packing>
+                <property name="pack_type">end</property>
+            </packing>
+        </child>
+    </template>
+</interface>
diff --git a/main/data/menu_app.ui b/main/data/menu_app.ui
index eb862ddb..eadbc81e 100644
--- a/main/data/menu_app.ui
+++ b/main/data/menu_app.ui
@@ -11,11 +11,5 @@
                 <attribute name="label" translatable="yes">Settings</attribute>
             </item>
         </section>
-        <section>
-            <item>
-                <attribute name="action">app.quit</attribute>
-                <attribute name="label" translatable="yes">Quit</attribute>
-            </item>
-        </section>
     </menu>
 </interface>
diff --git a/main/data/theme.css b/main/data/theme.css
index 174ce5b2..1969c80b 100644
--- a/main/data/theme.css
+++ b/main/data/theme.css
@@ -3,6 +3,14 @@
  * It provides sane defaults for things that are very Dino-specific.
  */
 
+window.dino-main .dino-header-right {
+    background: @theme_base_color;
+}
+
+window.dino-main .dino-header-left {
+    background: @insensitive_bg_color;
+}
+
 window.dino-main headerbar.dino-left label.title {
     opacity: 0;
     font-size: 0;
diff --git a/main/src/ui/application.vala b/main/src/ui/application.vala
index c34752a2..22c3256f 100644
--- a/main/src/ui/application.vala
+++ b/main/src/ui/application.vala
@@ -7,6 +7,7 @@ using Xmpp;
 public class Dino.Ui.Application : Gtk.Application, Dino.Application {
     private Notifications notifications;
     private UnifiedWindow window;
+    private UnifiedWindowController controller;
 
     public Database db { get; set; }
     public Dino.Entities.Settings settings { get; set; }
@@ -28,8 +29,10 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
 
         activate.connect(() => {
             if (window == null) {
-                create_set_app_menu();
+                controller = new UnifiedWindowController(this, stream_interactor, db);
                 window = new UnifiedWindow(this, stream_interactor, db);
+                controller.set_window(window);
+
                 notifications = new Notifications(stream_interactor, window);
                 notifications.start();
                 notifications.conversation_selected.connect((conversation) => window.on_conversation_selected(conversation));
@@ -79,6 +82,19 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
     }
 
     private void create_actions() {
+        SimpleAction accounts_action = new SimpleAction("accounts", null);
+        accounts_action.activate.connect(show_accounts_window);
+        add_action(accounts_action);
+
+        SimpleAction settings_action = new SimpleAction("settings", null);
+        settings_action.activate.connect(show_settings_window);
+        add_action(settings_action);
+
+        SimpleAction quit_action = new SimpleAction("quit", null);
+        quit_action.activate.connect(quit);
+        add_action(quit_action);
+        set_accels_for_action("app.quit", new string[]{"<Ctrl>Q"});
+
         SimpleAction open_conversation_action = new SimpleAction("open-conversation", VariantType.INT32);
         open_conversation_action.activate.connect((variant) => {
             Conversation? conversation = stream_interactor.get_module(ConversationManager.IDENTITY).get_conversation_by_id(variant.get_int32());
@@ -94,6 +110,26 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
             stream_interactor.get_module(PresenceManager.IDENTITY).deny_subscription(conversation.account, conversation.counterpart);
         });
         add_action(deny_subscription_action);
+
+        SimpleAction contacts_action = new SimpleAction("add_chat", null);
+        contacts_action.activate.connect(() => {
+            AddChatDialog add_chat_dialog = new AddChatDialog(stream_interactor, stream_interactor.get_accounts());
+            add_chat_dialog.set_transient_for(window);
+            add_chat_dialog.added.connect((conversation) => {
+                window.on_conversation_selected(conversation);
+            });
+            add_chat_dialog.present();
+        });
+        add_action(contacts_action);
+
+        SimpleAction conference_action = new SimpleAction("add_conference", null);
+        conference_action.activate.connect(() => {
+            AddConferenceDialog add_conference_dialog = new AddConferenceDialog(stream_interactor);
+            add_conference_dialog.set_transient_for(window);
+            add_conference_dialog.conversation_opened.connect(conversation => controller.select_conversation(conversation));
+            add_conference_dialog.present();
+        });
+        add_action(conference_action);
     }
 
     private void show_accounts_window() {
@@ -109,25 +145,5 @@ public class Dino.Ui.Application : Gtk.Application, Dino.Application {
         dialog.set_transient_for(get_active_window());
         dialog.present();
     }
-
-    private void create_set_app_menu() {
-        SimpleAction accounts_action = new SimpleAction("accounts", null);
-        accounts_action.activate.connect(show_accounts_window);
-        add_action(accounts_action);
-
-        SimpleAction settings_action = new SimpleAction("settings", null);
-        settings_action.activate.connect(show_settings_window);
-        add_action(settings_action);
-
-        SimpleAction quit_action = new SimpleAction("quit", null);
-        quit_action.activate.connect(quit);
-        add_action(quit_action);
-        set_accels_for_action("app.quit", new string[]{"<Ctrl>Q"});
-
-        Builder builder = new Builder.from_resource("/im/dino/Dino/menu_app.ui");
-        MenuModel menu = builder.get_object("menu_app") as MenuModel;
-
-        set_app_menu(menu);
-    }
 }
 
diff --git a/main/src/ui/conversation_list_titlebar.vala b/main/src/ui/conversation_list_titlebar.vala
index 60d9a6fb..abce2a6c 100644
--- a/main/src/ui/conversation_list_titlebar.vala
+++ b/main/src/ui/conversation_list_titlebar.vala
@@ -5,47 +5,28 @@ using Dino.Entities;
 namespace Dino.Ui {
 
 [GtkTemplate (ui = "/im/dino/Dino/conversation_list_titlebar.ui")]
-public class ConversationListTitlebar : Gtk.HeaderBar {
+public class ConversationListTitlebar : Gtk.Box {
 
     public signal void conversation_opened(Conversation conversation);
 
     [GtkChild] private MenuButton add_button;
+    [GtkChild] private MenuButton menu_button;
 
     private StreamInteractor stream_interactor;
 
     public ConversationListTitlebar(StreamInteractor stream_interactor, Window window) {
         this.stream_interactor = stream_interactor;
-
-        custom_title = new Label("Dino") { visible = true, hexpand = true, xalign = 0 };
-        custom_title.get_style_context().add_class("title");
-
         create_add_menu(window);
     }
 
     private void create_add_menu(Window window) {
-        SimpleAction contacts_action = new SimpleAction("add_chat", null);
-        contacts_action.activate.connect(() => {
-            AddChatDialog add_chat_dialog = new AddChatDialog(stream_interactor, stream_interactor.get_accounts());
-            add_chat_dialog.set_transient_for(window);
-            add_chat_dialog.added.connect((conversation) => {
-                conversation_opened(conversation);
-            });
-            add_chat_dialog.present();
-        });
-        GLib.Application.get_default().add_action(contacts_action);
+        Builder add_builder = new Builder.from_resource("/im/dino/Dino/menu_add.ui");
+        MenuModel add_menu_model = add_builder.get_object("menu_add") as MenuModel;
+        add_button.set_menu_model(add_menu_model);
 
-        SimpleAction conference_action = new SimpleAction("add_conference", null);
-        conference_action.activate.connect(() => {
-            AddConferenceDialog add_conference_dialog = new AddConferenceDialog(stream_interactor);
-            add_conference_dialog.set_transient_for(window);
-            add_conference_dialog.conversation_opened.connect((conversation) => conversation_opened(conversation));
-            add_conference_dialog.present();
-        });
-        GLib.Application.get_default().add_action(conference_action);
-
-        Builder builder = new Builder.from_resource("/im/dino/Dino/menu_add.ui");
-        MenuModel menu = builder.get_object("menu_add") as MenuModel;
-        add_button.set_menu_model(menu);
+        Builder menu_builder = new Builder.from_resource("/im/dino/Dino/menu_app.ui");
+        MenuModel menu_menu_model = menu_builder.get_object("menu_app") as MenuModel;
+        menu_button.set_menu_model(menu_menu_model);
     }
 }
 
diff --git a/main/src/ui/conversation_list_titlebar_csd.vala b/main/src/ui/conversation_list_titlebar_csd.vala
new file mode 100644
index 00000000..85ff4867
--- /dev/null
+++ b/main/src/ui/conversation_list_titlebar_csd.vala
@@ -0,0 +1,37 @@
+using Gtk;
+
+using Dino.Entities;
+
+namespace Dino.Ui {
+
+[GtkTemplate (ui = "/im/dino/Dino/conversation_list_titlebar_csd.ui")]
+public class ConversationListTitlebarCsd : Gtk.HeaderBar {
+
+    public signal void conversation_opened(Conversation conversation);
+
+    [GtkChild] private MenuButton add_button;
+    [GtkChild] private MenuButton menu_button;
+
+    private StreamInteractor stream_interactor;
+
+    public ConversationListTitlebarCsd(StreamInteractor stream_interactor, Window window) {
+        this.stream_interactor = stream_interactor;
+
+        custom_title = new Label("Dino") { visible = true, hexpand = true, xalign = 0 };
+        custom_title.get_style_context().add_class("title");
+
+        create_add_menu(window);
+    }
+
+    private void create_add_menu(Window window) {
+        Builder add_builder = new Builder.from_resource("/im/dino/Dino/menu_add.ui");
+        MenuModel add_menu_model = add_builder.get_object("menu_add") as MenuModel;
+        add_button.set_menu_model(add_menu_model);
+
+        Builder menu_builder = new Builder.from_resource("/im/dino/Dino/menu_app.ui");
+        MenuModel menu_menu_model = menu_builder.get_object("menu_app") as MenuModel;
+        menu_button.set_menu_model(menu_menu_model);
+    }
+}
+
+}
diff --git a/main/src/ui/conversation_titlebar/menu_entry.vala b/main/src/ui/conversation_titlebar/menu_entry.vala
index e77204a8..e62989a0 100644
--- a/main/src/ui/conversation_titlebar/menu_entry.vala
+++ b/main/src/ui/conversation_titlebar/menu_entry.vala
@@ -8,6 +8,7 @@ class MenuEntry : Plugins.ConversationTitlebarEntry, Object {
     public string id { get { return "menu"; } }
 
     StreamInteractor stream_interactor;
+    MenuWidget widget;
 
     public MenuEntry(StreamInteractor stream_interactor) {
         this.stream_interactor = stream_interactor;
@@ -16,30 +17,27 @@ class MenuEntry : Plugins.ConversationTitlebarEntry, Object {
     public double order { get { return 0; } }
     public Plugins.ConversationTitlebarWidget? get_widget(Plugins.WidgetType type) {
         if (type == Plugins.WidgetType.GTK) {
-            return new MenuWidget(stream_interactor) { visible=true };
+            if (widget == null) {
+                widget = new MenuWidget(stream_interactor) { visible=true };
+            }
+            return widget;
         }
         return null;
     }
 }
 
-class MenuWidget : MenuButton, Plugins.ConversationTitlebarWidget {
+class MenuWidget : Button, Plugins.ConversationTitlebarWidget {
 
     private Conversation? conversation;
 
     public MenuWidget(StreamInteractor stream_interactor) {
         image = new Image.from_icon_name("open-menu-symbolic", IconSize.MENU);
 
-        Builder builder = new Builder.from_resource("/im/dino/Dino/menu_conversation.ui");
-        MenuModel menu = builder.get_object("menu_conversation") as MenuModel;
-        set_menu_model(menu);
-
-        SimpleAction contact_details_action = new SimpleAction("contact_details", null);
-        contact_details_action.activate.connect(() => {
+        clicked.connect(() => {
             ContactDetails.Dialog contact_details_dialog = new ContactDetails.Dialog(stream_interactor, conversation);
             contact_details_dialog.set_transient_for((Window) get_toplevel());
             contact_details_dialog.present();
         });
-        GLib.Application.get_default().add_action(contact_details_action);
     }
 
     public new void set_conversation(Conversation conversation) {
diff --git a/main/src/ui/conversation_titlebar/occupants_entry.vala b/main/src/ui/conversation_titlebar/occupants_entry.vala
index 0646eee7..af553e35 100644
--- a/main/src/ui/conversation_titlebar/occupants_entry.vala
+++ b/main/src/ui/conversation_titlebar/occupants_entry.vala
@@ -8,17 +8,19 @@ class OccupantsEntry : Plugins.ConversationTitlebarEntry, Object {
     public string id { get { return "occupants"; } }
 
     StreamInteractor stream_interactor;
-    Window window;
+    OccupantsWidget widget;
 
-    public OccupantsEntry(StreamInteractor stream_interactor, Window window) {
+    public OccupantsEntry(StreamInteractor stream_interactor) {
         this.stream_interactor = stream_interactor;
-        this.window = window;
     }
 
     public double order { get { return 3; } }
     public Plugins.ConversationTitlebarWidget? get_widget(Plugins.WidgetType type) {
         if (type == Plugins.WidgetType.GTK) {
-            return new OccupantsWidget(stream_interactor, window) { visible=true };
+            if (widget == null) {
+                widget = new OccupantsWidget(stream_interactor) { visible=true };
+            }
+            return widget;
         }
         return null;
     }
@@ -28,14 +30,12 @@ class OccupantsWidget : MenuButton, Plugins.ConversationTitlebarWidget {
 
     private Conversation? conversation;
     private StreamInteractor stream_interactor;
-    private Window window;
     private OccupantMenu.View menu = null;
 
-    public OccupantsWidget(StreamInteractor stream_interactor, Window window) {
+    public OccupantsWidget(StreamInteractor stream_interactor) {
         image = new Image.from_icon_name("system-users-symbolic", IconSize.MENU);
 
         this.stream_interactor = stream_interactor;
-        this.window = window;
         set_use_popover(true);
     }
 
@@ -44,7 +44,7 @@ class OccupantsWidget : MenuButton, Plugins.ConversationTitlebarWidget {
 
         visible = conversation.type_ == Conversation.Type.GROUPCHAT;
         if (conversation.type_ == Conversation.Type.GROUPCHAT) {
-            OccupantMenu.View new_menu = new OccupantMenu.View(stream_interactor, window, conversation);
+            OccupantMenu.View new_menu = new OccupantMenu.View(stream_interactor, conversation);
             set_popover(new_menu);
             if (menu != null) menu.destroy();
             menu = new_menu;
diff --git a/main/src/ui/conversation_titlebar/search_entry.vala b/main/src/ui/conversation_titlebar/search_entry.vala
index b452bdce..ff0ff325 100644
--- a/main/src/ui/conversation_titlebar/search_entry.vala
+++ b/main/src/ui/conversation_titlebar/search_entry.vala
@@ -8,10 +8,10 @@ namespace Dino.Ui {
 public class SearchMenuEntry : Plugins.ConversationTitlebarEntry, Object {
     public string id { get { return "search"; } }
 
-    Plugins.ConversationTitlebarWidget search_button;
+    public GlobalSearchButton search_button = new GlobalSearchButton() { visible = true };
 
-    public SearchMenuEntry(Plugins.ConversationTitlebarWidget search_button) {
-        this.search_button = search_button;
+    public SearchMenuEntry() {
+        search_button.set_image(new Gtk.Image.from_icon_name("system-search-symbolic", Gtk.IconSize.MENU) { visible = true });
     }
 
     public double order { get { return 1; } }
diff --git a/main/src/ui/conversation_titlebar/view.vala b/main/src/ui/conversation_titlebar/view.vala
index 7ced9830..cb31527e 100644
--- a/main/src/ui/conversation_titlebar/view.vala
+++ b/main/src/ui/conversation_titlebar/view.vala
@@ -1,83 +1,67 @@
 using Gtk;
 using Gee;
+using Pango;
 
 using Dino.Entities;
 
 namespace Dino.Ui {
 
-public class ConversationTitlebar : Gtk.HeaderBar {
+public class ConversationTitlebar : Gtk.Box {
+
+    public string? title {
+        get { return title_label.label; }
+        set { this.title_label.label = value; }
+    }
+
+    public string? subtitle {
+        get { return subtitle_label.label; }
+        set {
+            this.subtitle_label.label = "<span size='small'>" + value + "</span>";
+            this.subtitle_label.visible = (value != null);
+        }
+    }
 
     private StreamInteractor stream_interactor;
-    private Window window;
     private Conversation? conversation;
-    private Gee.List<Plugins.ConversationTitlebarWidget> widgets = new ArrayList<Plugins.ConversationTitlebarWidget>();
+
+    private Box content_box = new Box(Orientation.HORIZONTAL, 0) { margin=5, margin_start=15, margin_end=5, hexpand=true, visible=true };
+    private Label title_label = new Label("") { visible=true };
+    private Label subtitle_label = new Label("") { use_markup=true, ellipsize=EllipsizeMode.END, visible=false };
     public GlobalSearchButton search_button = new GlobalSearchButton() { visible = true };
 
-    public ConversationTitlebar(StreamInteractor stream_interactor, Window window) {
-        this.stream_interactor = stream_interactor;
-        this.window = window;
+    construct {
+        this.add(content_box);
 
-        this.get_style_context().add_class("dino-right");
-        show_close_button = true;
+        Box titles_box = new Box(Orientation.VERTICAL, 0) { valign=Align.CENTER, hexpand=true, visible=true };
+        content_box.add(titles_box);
+
+        titles_box.add(title_label);
+        subtitle_label.attributes = new AttrList();
+        subtitle_label.get_style_context().add_class("dim-label");
+        titles_box.add(subtitle_label);
+
+        Box placeholder_box = new Box(Orientation.VERTICAL, 0) { visible=true };
+        placeholder_box.add(new Label("") { xalign=0, visible=true });
+        placeholder_box.add(new Label("<span size='small'> </span>") { use_markup=true, xalign=0, visible=true });
+        content_box.add(placeholder_box);
+    }
+
+    public ConversationTitlebar(StreamInteractor stream_interactor) {
+        this.stream_interactor = stream_interactor;
+
+        this.get_style_context().add_class("dino-header-right");
         hexpand = true;
         search_button.set_image(new Gtk.Image.from_icon_name("system-search-symbolic", Gtk.IconSize.MENU) { visible = true });
 
         Application app = GLib.Application.get_default() as Application;
-        app.plugin_registry.register_contact_titlebar_entry(new MenuEntry(stream_interactor));
-        app.plugin_registry.register_contact_titlebar_entry(new SearchMenuEntry(search_button));
-        app.plugin_registry.register_contact_titlebar_entry(new OccupantsEntry(stream_interactor, window));
-
         foreach(var e in app.plugin_registry.conversation_titlebar_entries) {
             Plugins.ConversationTitlebarWidget widget = e.get_widget(Plugins.WidgetType.GTK);
             if (widget != null) {
-                widgets.add(widget);
-                pack_end((Gtk.Widget)widget);
+                Button gtk_widget = (Gtk.Button)widget;
+                gtk_widget.relief = ReliefStyle.NONE;
+                content_box.add(gtk_widget);
             }
         }
-
-
-        stream_interactor.get_module(MucManager.IDENTITY).room_name_set.connect((account, jid, room_name) => {
-            if (conversation != null && conversation.counterpart.equals_bare(jid) && conversation.account.equals(account)) {
-                update_title();
-            }
-        });
-
-        stream_interactor.get_module(MucManager.IDENTITY).private_room_occupant_updated.connect((account, room, occupant) => {
-            if (conversation != null && conversation.counterpart.equals_bare(room.bare_jid) && conversation.account.equals(account)) {
-                update_title();
-            }
-        });
-
-        stream_interactor.get_module(MucManager.IDENTITY).subject_set.connect((account, jid, subject) => {
-            if (conversation != null && conversation.counterpart.equals_bare(jid) && conversation.account.equals(account)) {
-                update_subtitle(subject);
-            }
-        });
-    }
-
-    public void initialize_for_conversation(Conversation conversation) {
-        this.conversation = conversation;
-        update_title();
-        update_subtitle();
-
-        foreach (Plugins.ConversationTitlebarWidget widget in widgets) {
-            widget.set_conversation(conversation);
-        }
-    }
-
-    private void update_title() {
-        set_title(Util.get_conversation_display_name(stream_interactor, conversation));
-    }
-
-    private void update_subtitle(string? subtitle = null) {
-        if (subtitle != null) {
-            set_subtitle(subtitle);
-        } else if (conversation.type_ == Conversation.Type.GROUPCHAT) {
-            string subject = stream_interactor.get_module(MucManager.IDENTITY).get_groupchat_subject(conversation.counterpart, conversation.account);
-            set_subtitle(subject != "" ? subject : null);
-        } else {
-            set_subtitle(null);
-        }
     }
 }
 
diff --git a/main/src/ui/conversation_titlebar/view_csd.vala b/main/src/ui/conversation_titlebar/view_csd.vala
new file mode 100644
index 00000000..83a1a474
--- /dev/null
+++ b/main/src/ui/conversation_titlebar/view_csd.vala
@@ -0,0 +1,38 @@
+using Gtk;
+using Gee;
+
+using Dino.Entities;
+
+namespace Dino.Ui {
+
+public class ConversationTitlebarCsd : Gtk.HeaderBar {
+
+    private StreamInteractor stream_interactor;
+    private Window window;
+    private Conversation? conversation;
+
+    public ConversationTitlebarCsd(StreamInteractor stream_interactor, Window window) {
+        this.stream_interactor = stream_interactor;
+        this.window = window;
+
+        this.get_style_context().add_class("dino-right");
+        show_close_button = true;
+        hexpand = true;
+
+        Application app = GLib.Application.get_default() as Application;
+        ArrayList<Plugins.ConversationTitlebarWidget> widgets = new ArrayList<Plugins.ConversationTitlebarWidget>();
+        foreach(var e in app.plugin_registry.conversation_titlebar_entries) {
+            Plugins.ConversationTitlebarWidget widget = e.get_widget(Plugins.WidgetType.GTK);
+            if (widget != null) {
+                widgets.insert(0, widget);
+            }
+        }
+        foreach (var w in widgets) {
+            Button gtk_widget = (Gtk.Button)w;
+            gtk_widget.relief = ReliefStyle.NONE;
+            this.pack_end(gtk_widget);
+        }
+    }
+}
+
+}
diff --git a/main/src/ui/global_search.vala b/main/src/ui/global_search.vala
index 99a69e1b..73a61dc5 100644
--- a/main/src/ui/global_search.vala
+++ b/main/src/ui/global_search.vala
@@ -7,7 +7,7 @@ using Dino.Entities;
 namespace Dino.Ui {
 
 [GtkTemplate (ui = "/im/dino/Dino/global_search.ui")]
-class GlobalSearch : Overlay {
+public class GlobalSearch : Overlay {
     public signal void selected_item(MessageItem item);
     private StreamInteractor stream_interactor;
     private string search = "";
diff --git a/main/src/ui/occupant_menu/view.vala b/main/src/ui/occupant_menu/view.vala
index 1115d0ab..0d11a310 100644
--- a/main/src/ui/occupant_menu/view.vala
+++ b/main/src/ui/occupant_menu/view.vala
@@ -15,7 +15,7 @@ public class View : Popover {
     private ListBox invite_list;
     private Box? jid_menu = null;
 
-    public View(StreamInteractor stream_interactor, Window window, Conversation conversation) {
+    public View(StreamInteractor stream_interactor, Conversation conversation) {
         this.stream_interactor = stream_interactor;
         this.conversation = conversation;
 
@@ -31,7 +31,7 @@ public class View : Popover {
             Gee.List<Account> acc_list = new ArrayList<Account>(Account.equals_func);
             acc_list.add(conversation.account);
             SelectContactDialog add_chat_dialog = new SelectContactDialog(stream_interactor, acc_list);
-            add_chat_dialog.set_transient_for(window);
+            add_chat_dialog.set_transient_for((Window) get_toplevel());
             add_chat_dialog.title = _("Invite to Conference");
             add_chat_dialog.ok_button.label = _("Invite");
             add_chat_dialog.selected.connect((account, jid) => {
diff --git a/main/src/ui/unified_window.vala b/main/src/ui/unified_window.vala
index 28bec42d..8338573e 100644
--- a/main/src/ui/unified_window.vala
+++ b/main/src/ui/unified_window.vala
@@ -8,22 +8,53 @@ namespace Dino.Ui {
 
 public class UnifiedWindow : Gtk.Window {
 
-    private WelcomePlceholder welcome_placeholder = new WelcomePlceholder() { visible=true };
-    private NoAccountsPlaceholder accounts_placeholder = new NoAccountsPlaceholder() { visible=true };
-    private NoConversationsPlaceholder conversations_placeholder = new NoConversationsPlaceholder() { visible=true };
-    private ChatInput.View chat_input;
-    private ConversationListTitlebar conversation_list_titlebar;
-    private ConversationSelector.View filterable_conversation_list;
-    private ConversationSummary.ConversationView conversation_frame;
-    private ConversationTitlebar conversation_titlebar;
-    private HeaderBar placeholder_headerbar = new HeaderBar() { title="Dino", show_close_button=true, visible=true };
-    private Paned headerbar_paned = new Paned(Orientation.HORIZONTAL) { visible=true };
-    private Paned paned;
-    private Revealer goto_end_revealer;
-    private Button goto_end_button;
-    private Revealer search_revealer;
-    private SearchEntry search_entry;
-    private GlobalSearch search_box;
+    public signal void conversation_selected(Conversation conversation);
+
+    public new string? title {
+        get {
+            return Util.use_csd() ? conversation_titlebar_csd.title : conversation_titlebar.title;
+        }
+        set {
+            if (Util.use_csd()) {
+                conversation_titlebar_csd.title = value;
+            } else {
+                conversation_titlebar.title = value;
+            }
+        }
+    }
+
+    public string? subtitle {
+        get {
+            return Util.use_csd() ? conversation_titlebar_csd.subtitle : conversation_titlebar.subtitle;
+        }
+        set {
+            if (Util.use_csd()) {
+                conversation_titlebar_csd.subtitle = value;
+            } else {
+                conversation_titlebar.subtitle = value;
+            }
+        }
+    }
+
+    public WelcomePlceholder welcome_placeholder = new WelcomePlceholder() { visible=true };
+    public NoAccountsPlaceholder accounts_placeholder = new NoAccountsPlaceholder() { visible=true };
+    public NoConversationsPlaceholder conversations_placeholder = new NoConversationsPlaceholder() { visible=true };
+    public ChatInput.View chat_input;
+    public ConversationListTitlebar conversation_list_titlebar;
+    public ConversationListTitlebarCsd conversation_list_titlebar_csd;
+    public ConversationSelector.View filterable_conversation_list;
+    public ConversationSummary.ConversationView conversation_frame;
+    public ConversationTitlebar conversation_titlebar;
+    public ConversationTitlebarCsd conversation_titlebar_csd;
+    public HeaderBar placeholder_headerbar = new HeaderBar() { title="Dino", show_close_button=true, visible=true };
+    public Box box = new Box(Orientation.VERTICAL, 0) { orientation=Orientation.VERTICAL, visible=true };
+    public Paned headerbar_paned = new Paned(Orientation.HORIZONTAL) { visible=true };
+    public Paned paned;
+    public Revealer goto_end_revealer;
+    public Button goto_end_button;
+    public Revealer search_revealer;
+    public SearchEntry search_entry;
+    public GlobalSearch search_box;
     private Stack stack = new Stack() { visible=true };
 
     private StreamInteractor stream_interactor;
@@ -37,118 +68,34 @@ public class UnifiedWindow : Gtk.Window {
         this.stream_interactor = stream_interactor;
         this.db = db;
 
-        restore_window_size();
-
-
         this.get_style_context().add_class("dino-main");
         setup_headerbar();
         setup_unified();
         setup_stack();
 
-        var vadjustment = conversation_frame.scrolled.vadjustment;
-        vadjustment.notify["value"].connect(() => {
-            goto_end_revealer.reveal_child = vadjustment.value <  vadjustment.upper - vadjustment.page_size;
-        });
-        goto_end_button.clicked.connect(() => {
-            conversation_frame.initialize_for_conversation(conversation);
-        });
-
-        conversation_titlebar.search_button.clicked.connect(() => {
-            search_revealer.reveal_child = conversation_titlebar.search_button.active;
-        });
-        search_revealer.notify["child-revealed"].connect(() => {
-            if (search_revealer.child_revealed) {
-                if (conversation_frame.conversation != null && search_box.search_entry.text == "") {
-                    reset_search_entry();
-                }
-                search_box.search_entry.grab_focus();
-            }
-        });
-        search_box.selected_item.connect((item) => {
-            on_conversation_selected(item.conversation, false, false);
-            conversation_frame.initialize_around_message(item.conversation, item);
-            close_search();
-        });
-        event.connect((event) => {
-            if (event.type == EventType.BUTTON_PRESS) {
-                int dest_x, dest_y;
-                bool ret = search_box.translate_coordinates(this, 0, 0, out dest_x, out dest_y);
-                int geometry_x, geometry_y, geometry_width, geometry_height;
-                this.get_window().get_geometry(out geometry_x, out geometry_y, out geometry_width, out geometry_height);
-                if (ret && event.button.x_root - geometry_x < dest_x || event.button.y_root - geometry_y < dest_y) {
-                    close_search();
-                }
-            } else if (event.type == EventType.KEY_RELEASE) {
-                if (event.key.keyval == Gdk.Key.Escape) {
-                    close_search();
-                }
-            }
-            return false;
-        });
-
-        paned.bind_property("position", headerbar_paned, "position", BindingFlags.SYNC_CREATE | BindingFlags.BIDIRECTIONAL);
-
-        focus_in_event.connect(on_focus_in_event);
-        focus_out_event.connect(on_focus_out_event);
-
         stream_interactor.account_added.connect((account) => { check_stack(true); });
         stream_interactor.account_removed.connect((account) => { check_stack(); });
         stream_interactor.get_module(ConversationManager.IDENTITY).conversation_activated.connect(() => check_stack());
         stream_interactor.get_module(ConversationManager.IDENTITY).conversation_deactivated.connect(() => check_stack());
-        welcome_placeholder.primary_button.clicked.connect(() => {
-            ManageAccounts.AddAccountDialog dialog = new ManageAccounts.AddAccountDialog(stream_interactor);
-            dialog.set_transient_for(app.get_active_window());
-            dialog.present();
-        });
-        accounts_placeholder.primary_button.clicked.connect(() => { get_application().activate_action("accounts", null); });
-        conversations_placeholder.primary_button.clicked.connect(() => { get_application().activate_action("add_chat", null); });
-        conversations_placeholder.secondary_button.clicked.connect(() => { get_application().activate_action("add_conference", null); });
-        filterable_conversation_list.conversation_list.conversation_selected.connect((conversation) => on_conversation_selected(conversation));
-        conversation_list_titlebar.conversation_opened.connect((conversation) => on_conversation_selected(conversation));
+
+        paned.bind_property("position", headerbar_paned, "position", BindingFlags.SYNC_CREATE | BindingFlags.BIDIRECTIONAL);
 
         check_stack();
     }
 
-    private void reset_search_entry() {
-        if (conversation_frame.conversation != null) {
-            switch (conversation.type_) {
-                case Conversation.Type.CHAT:
-                case Conversation.Type.GROUPCHAT_PM:
-                    search_box.search_entry.text = @"with:$(conversation.counterpart) ";
-                    break;
-                case Conversation.Type.GROUPCHAT:
-                    search_box.search_entry.text = @"in:$(conversation.counterpart) ";
-                    break;
-            }
-        }
-    }
-
     public void on_conversation_selected(Conversation conversation, bool do_reset_search = true, bool default_initialize_conversation = true) {
         if (this.conversation == null || !this.conversation.equals(conversation)) {
             this.conversation = conversation;
-            stream_interactor.get_module(ChatInteraction.IDENTITY).on_conversation_selected(conversation);
-            conversation.active = true; // only for conversation_selected
-            filterable_conversation_list.conversation_list.on_conversation_selected(conversation); // only for conversation_opened
+            conversation_selected(conversation);
+
 
-            if (do_reset_search) {
-                reset_search_entry();
-            }
-            chat_input.initialize_for_conversation(conversation);
-            if (default_initialize_conversation) {
-                conversation_frame.initialize_for_conversation(conversation);
-            }
-            conversation_titlebar.initialize_for_conversation(conversation);
         }
     }
 
-    private void close_search() {
-        conversation_titlebar.search_button.active = false;
-        search_revealer.reveal_child = false;
-    }
-
     private void setup_unified() {
         Builder builder = new Builder.from_resource("/im/dino/Dino/unified_main_content.ui");
         paned = (Paned) builder.get_object("paned");
+        box.add(paned);
         chat_input = ((ChatInput.View) builder.get_object("chat_input")).init(stream_interactor);
         conversation_frame = ((ConversationSummary.ConversationView) builder.get_object("conversation_frame")).init(stream_interactor);
         filterable_conversation_list = ((ConversationSelector.View) builder.get_object("conversation_list")).init(stream_interactor);
@@ -160,27 +107,36 @@ public class UnifiedWindow : Gtk.Window {
     }
 
     private void setup_headerbar() {
-        conversation_titlebar = new ConversationTitlebar(stream_interactor, this) { visible=true };
-        conversation_list_titlebar = new ConversationListTitlebar(stream_interactor, this) { visible=true };
-        headerbar_paned.pack1(conversation_list_titlebar, false, false);
-        headerbar_paned.pack2(conversation_titlebar, true, false);
+        if (Util.use_csd()) {
+            conversation_titlebar_csd = new ConversationTitlebarCsd(stream_interactor, this) { visible=true };
+            conversation_list_titlebar_csd = new ConversationListTitlebarCsd(stream_interactor, this) { visible=true };
+            headerbar_paned.pack1(conversation_list_titlebar_csd, false, false);
+            headerbar_paned.pack2(conversation_titlebar_csd, true, false);
 
-        // Distribute start/end decoration_layout buttons to left/right headerbar. Ensure app menu fallback.
-        Gtk.Settings? gtk_settings = Gtk.Settings.get_default();
-        if (gtk_settings != null) {
-            if (!gtk_settings.gtk_decoration_layout.contains("menu")) {
-                gtk_settings.gtk_decoration_layout = "menu:" + gtk_settings.gtk_decoration_layout;
-            }
-            string[] decoration_layout = gtk_settings.gtk_decoration_layout.split(":");
-            if (decoration_layout.length == 2) {
-                conversation_list_titlebar.decoration_layout = decoration_layout[0] + ":";
-                conversation_titlebar.decoration_layout = ":" + decoration_layout[1];
+            // Distribute start/end decoration_layout buttons to left/right headerbar. Ensure app menu fallback.
+            Gtk.Settings? gtk_settings = Gtk.Settings.get_default();
+            if (gtk_settings != null) {
+                if (!gtk_settings.gtk_decoration_layout.contains("menu")) {
+                    gtk_settings.gtk_decoration_layout = "menu:" + gtk_settings.gtk_decoration_layout;
+                }
+                string[] decoration_layout = gtk_settings.gtk_decoration_layout.split(":");
+                if (decoration_layout.length == 2) {
+                    conversation_list_titlebar_csd.decoration_layout = decoration_layout[0] + ":";
+                    conversation_titlebar_csd.decoration_layout = ":" + decoration_layout[1];
+                }
             }
+        } else {
+            conversation_list_titlebar = new ConversationListTitlebar(stream_interactor, this) { visible=true };
+            conversation_titlebar = new ConversationTitlebar(stream_interactor) { visible=true };
+            headerbar_paned.pack1(conversation_list_titlebar, false, false);
+            headerbar_paned.pack2(conversation_titlebar, true, false);
+
+            box.add(headerbar_paned);
         }
     }
 
     private void setup_stack() {
-        stack.add_named(paned, "main");
+        stack.add_named(box, "main");
         stack.add_named(welcome_placeholder, "welcome_placeholder");
         stack.add_named(accounts_placeholder, "accounts_placeholder");
         stack.add_named(conversations_placeholder, "conversations_placeholder");
@@ -192,54 +148,24 @@ public class UnifiedWindow : Gtk.Window {
         if (!know_exists && accounts.size == 0) {
             if (db.get_accounts().size == 0) {
                 stack.set_visible_child_name("welcome_placeholder");
-                set_titlebar(placeholder_headerbar);
             } else {
                 stack.set_visible_child_name("accounts_placeholder");
+            }
+            if (Util.use_csd()) {
                 set_titlebar(placeholder_headerbar);
             }
         } else if (stream_interactor.get_module(ConversationManager.IDENTITY).get_active_conversations().size == 0) {
             stack.set_visible_child_name("conversations_placeholder");
-            set_titlebar(placeholder_headerbar);
+            if (Util.use_csd()) {
+                set_titlebar(placeholder_headerbar);
+            }
         } else {
             stack.set_visible_child_name("main");
-            set_titlebar(headerbar_paned);
+            if (Util.use_csd()) {
+                set_titlebar(headerbar_paned);
+            }
         }
     }
-
-    private void restore_window_size() {
-        default_width = app.settings.current_width;
-        default_height = app.settings.current_height;
-        if (app.settings.is_maximized) this.maximize();
-        if (app.settings.position_x != -1 && app.settings.position_y != -1) {
-            move(app.settings.position_x, app.settings.position_y);
-        }
-
-        delete_event.connect(() => {
-            int x, y;
-            get_position(out x, out y);
-            app.settings.position_x = x;
-            app.settings.position_y = y;
-
-            int width, height;
-            get_size(out width, out height);
-            app.settings.current_width = width;
-            app.settings.current_height = height;
-
-            app.settings.is_maximized = is_maximized;
-            return false;
-        });
-    }
-
-    private bool on_focus_in_event() {
-        stream_interactor.get_module(ChatInteraction.IDENTITY).on_window_focus_in(conversation);
-        urgency_hint = false;
-        return false;
-    }
-
-    private bool on_focus_out_event() {
-        stream_interactor.get_module(ChatInteraction.IDENTITY).on_window_focus_out(conversation);
-        return false;
-    }
 }
 
 public class WelcomePlceholder : UnifiedWindowPlaceholder {
diff --git a/main/src/ui/unified_window_controller.vala b/main/src/ui/unified_window_controller.vala
new file mode 100644
index 00000000..dce5b39f
--- /dev/null
+++ b/main/src/ui/unified_window_controller.vala
@@ -0,0 +1,204 @@
+using Gee;
+using Gdk;
+using Gtk;
+
+using Dino.Entities;
+
+namespace Dino.Ui {
+
+public class UnifiedWindowController : Object {
+
+    public new string? conversation_display_name { get; set; }
+    public string? conversation_topic { get; set; }
+
+    private StreamInteractor stream_interactor;
+    private Conversation? conversation;
+    private Application app;
+    private Database db;
+    private UnifiedWindow window;
+
+    private SearchMenuEntry search_menu_entry = new SearchMenuEntry();
+
+    public UnifiedWindowController(Application application, StreamInteractor stream_interactor, Database db) {
+        this.app = application;
+        this.stream_interactor = stream_interactor;
+        this.db = db;
+
+        stream_interactor.get_module(MucManager.IDENTITY).room_name_set.connect((account, jid, room_name) => {
+            if (conversation != null && conversation.counterpart.equals_bare(jid) && conversation.account.equals(account)) {
+                update_conversation_display_name();
+            }
+        });
+
+        stream_interactor.get_module(MucManager.IDENTITY).private_room_occupant_updated.connect((account, room, occupant) => {
+            if (conversation != null && conversation.counterpart.equals_bare(room.bare_jid) && conversation.account.equals(account)) {
+                update_conversation_display_name();
+            }
+        });
+
+        stream_interactor.get_module(MucManager.IDENTITY).subject_set.connect((account, jid, subject) => {
+            if (conversation != null && conversation.counterpart.equals_bare(jid) && conversation.account.equals(account)) {
+                update_conversation_topic(subject);
+            }
+        });
+
+        app.plugin_registry.register_contact_titlebar_entry(new MenuEntry(stream_interactor));
+        app.plugin_registry.register_contact_titlebar_entry(search_menu_entry);
+        app.plugin_registry.register_contact_titlebar_entry(new OccupantsEntry(stream_interactor));
+    }
+
+    public void set_window(UnifiedWindow window) {
+        this.window = window;
+
+        this.bind_property("conversation-display-name", window, "title");
+        this.bind_property("conversation-topic", window, "subtitle");
+        search_menu_entry.search_button.bind_property("active", window.search_revealer, "reveal_child");
+
+        window.goto_end_button.clicked.connect(() => {
+            window.conversation_frame.initialize_for_conversation(conversation);
+        });
+        window.search_revealer.notify["child-revealed"].connect(() => {
+            if (window.search_revealer.child_revealed) {
+                if (window.conversation_frame.conversation != null && window.search_box.search_entry.text == "") {
+                    reset_search_entry();
+                }
+                window.search_box.search_entry.grab_focus();
+            }
+        });
+        window.search_box.selected_item.connect((item) => {
+            select_conversation(item.conversation, false, false);
+            window.conversation_frame.initialize_around_message(item.conversation, item);
+            close_search();
+        });
+
+        window.welcome_placeholder.primary_button.clicked.connect(() => {
+            ManageAccounts.AddAccountDialog dialog = new ManageAccounts.AddAccountDialog(stream_interactor);
+            dialog.set_transient_for(app.get_active_window());
+            dialog.present();
+        });
+        window.accounts_placeholder.primary_button.clicked.connect(() => { app.activate_action("accounts", null); });
+        window.conversations_placeholder.primary_button.clicked.connect(() => { app.activate_action("add_chat", null); });
+        window.conversations_placeholder.secondary_button.clicked.connect(() => { app.activate_action("add_conference", null); });
+        window.filterable_conversation_list.conversation_list.conversation_selected.connect((conversation) => select_conversation(conversation));
+
+        var vadjustment = window.conversation_frame.scrolled.vadjustment;
+        vadjustment.notify["value"].connect(() => {
+            window.goto_end_revealer.reveal_child = vadjustment.value <  vadjustment.upper - vadjustment.page_size;
+        });
+        window.event.connect((event) => {
+            if (event.type == EventType.BUTTON_PRESS) {
+                int dest_x, dest_y;
+                bool ret = window.search_box.translate_coordinates(window, 0, 0, out dest_x, out dest_y);
+                int geometry_x, geometry_y, geometry_width, geometry_height;
+                window.get_window().get_geometry(out geometry_x, out geometry_y, out geometry_width, out geometry_height);
+                if (ret && event.button.x_root - geometry_x < dest_x || event.button.y_root - geometry_y < dest_y) {
+                    close_search();
+                }
+            } else if (event.type == EventType.KEY_RELEASE) {
+                if (event.key.keyval == Gdk.Key.Escape) {
+                    close_search();
+                }
+            }
+            return false;
+        });
+        window.focus_in_event.connect(() => {
+            stream_interactor.get_module(ChatInteraction.IDENTITY).on_window_focus_in(conversation);
+            window.urgency_hint = false;
+            return false;
+        });
+        window.focus_out_event.connect(() => {
+            stream_interactor.get_module(ChatInteraction.IDENTITY).on_window_focus_out(conversation);
+            return false;
+        });
+
+        window.conversation_selected.connect(conversation => select_conversation(conversation));
+
+        restore_window_size();
+    }
+
+    public void select_conversation(Conversation conversation, bool do_reset_search = true, bool default_initialize_conversation = true) {
+        this.conversation = conversation;
+
+        update_conversation_display_name();
+        update_conversation_topic();
+
+        foreach(var e in this.app.plugin_registry.conversation_titlebar_entries) {
+            Plugins.ConversationTitlebarWidget widget = e.get_widget(Plugins.WidgetType.GTK);
+            if (widget != null) {
+                widget.set_conversation(conversation);
+            }
+        }
+
+        stream_interactor.get_module(ChatInteraction.IDENTITY).on_conversation_selected(conversation);
+        conversation.active = true; // only for conversation_selected
+        window.filterable_conversation_list.conversation_list.on_conversation_selected(conversation); // only for conversation_opened
+
+        if (do_reset_search) {
+            reset_search_entry();
+        }
+        window.chat_input.initialize_for_conversation(conversation);
+        if (default_initialize_conversation) {
+            window.conversation_frame.initialize_for_conversation(conversation);
+        }
+    }
+
+    private void update_conversation_display_name() {
+        conversation_display_name = Util.get_conversation_display_name(stream_interactor, conversation);
+    }
+
+    private void update_conversation_topic(string? subtitle = null) {
+        if (conversation_topic != null) {
+            conversation_topic = subtitle;
+        } else if (conversation.type_ == Conversation.Type.GROUPCHAT) {
+            string subject = stream_interactor.get_module(MucManager.IDENTITY).get_groupchat_subject(conversation.counterpart, conversation.account);
+            conversation_topic = subject != "" ? subject : null;
+        } else {
+            conversation_topic = null;
+        }
+    }
+
+    private void reset_search_entry() {
+        if (window.conversation_frame.conversation != null) {
+            switch (conversation.type_) {
+                case Conversation.Type.CHAT:
+                case Conversation.Type.GROUPCHAT_PM:
+                    window.search_box.search_entry.text = @"with:$(conversation.counterpart) ";
+                    break;
+                case Conversation.Type.GROUPCHAT:
+                    window.search_box.search_entry.text = @"in:$(conversation.counterpart) ";
+                    break;
+            }
+        }
+    }
+
+    private void close_search() {
+        search_menu_entry.search_button.active = false;
+        window.search_revealer.reveal_child = false;
+    }
+
+    private void restore_window_size() {
+        window.default_width = app.settings.current_width;
+        window.default_height = app.settings.current_height;
+        if (app.settings.is_maximized) window.maximize();
+        if (app.settings.position_x != -1 && app.settings.position_y != -1) {
+            window.move(app.settings.position_x, app.settings.position_y);
+        }
+
+        window.delete_event.connect(() => {
+            int x, y;
+            window.get_position(out x, out y);
+            app.settings.position_x = x;
+            app.settings.position_y = y;
+
+            int width, height;
+            window.get_size(out width, out height);
+            app.settings.current_width = width;
+            app.settings.current_height = height;
+
+            app.settings.is_maximized = window.is_maximized;
+            return false;
+        });
+    }
+}
+
+}
diff --git a/main/src/ui/util/helper.vala b/main/src/ui/util/helper.vala
index 406a879e..5feda242 100644
--- a/main/src/ui/util/helper.vala
+++ b/main/src/ui/util/helper.vala
@@ -264,4 +264,8 @@ public int get_only_emoji_count(string markup_text) {
     return emoji_no;
 }
 
+public bool use_csd() {
+    return Environment.get_variable("GTK_CSD") != "0";
+}
+
 }