feat: implement title bar and caption buttons.

demo/Ursa.Demo/Views/MainView.axaml

@@ -22,8 +22,7 @@
     <Panel>
         <Grid
             Classes.Blur="{Binding #host.HasModal}"
-            ColumnDefinitions="Auto, *"
-            RowDefinitions="Auto, *">
+            ColumnDefinitions="Auto, *" >
             <Grid.Styles>
                 <Style Selector="Grid.Blur">
                     <Setter Property="Effect" Value="blur(20)" />
@@ -31,7 +30,6 @@
             </Grid.Styles>
             <Border
                 Padding="8 4"
-                Grid.RowSpan="2"
                 VerticalAlignment="Stretch"
                 Theme="{DynamicResource CardBorder}">
                 <u:NavMenu Name="menu" ItemsSource="{Binding Menus.MenuItems}"
@@ -89,16 +87,9 @@
                     </u:NavMenu.Header>
                 </u:NavMenu>
             </Border>
-            <u:ThemeToggleButton
-                Grid.Row="0"
-                Grid.Column="1"
-                IsThreeState="True"
-                Mode="Controller"
-                HorizontalAlignment="Right" />
             <ContentControl
-                Grid.Row="1"
                 Grid.Column="1"
-                Margin="12"
+                Margin="12 36 12 12"
                 Content="{Binding Content}">
                 <ContentControl.ContentTemplate>
                     <converters:ViewLocator />

demo/Ursa.Demo/Views/MainWindow.axaml

@@ -11,8 +11,14 @@
     d:DesignHeight="450"
     d:DesignWidth="800"
     x:CompileBindings="True"
+    IsFullScreenButtonVisible="True"
     x:DataType="viewModels:MainWindowViewModel"
     Icon="/Assets/Ursa.ico"
     mc:Ignorable="d">
+    <u:UrsaWindow.RightContent>
+        <u:ThemeToggleButton
+            IsThreeState="True"
+            Mode="Controller" />
+    </u:UrsaWindow.RightContent>
     <views:MainView />
 </u:UrsaWindow>

demo/Ursa.Demo/Views/MainWindow.axaml.cs

@@ -1,9 +1,11 @@
+using System;
 using Avalonia.Controls;
 using Avalonia.Interactivity;
+using Ursa.Controls;
 
 namespace Ursa.Demo.Views;
 
-public partial class MainWindow : Window
+public partial class MainWindow : UrsaWindow
 {
     public MainWindow()
     {