feat: single view trial.

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

@@ -0,0 +1,23 @@
+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+
+namespace Ursa.Demo.Views;
+
+public partial class TitleBarRightContent : UserControl
+{
+    public TitleBarRightContent()
+    {
+        InitializeComponent();
+    }
+
+    private async void OpenRepository(object? sender, RoutedEventArgs e)
+    {
+        var top = TopLevel.GetTopLevel(this);
+        if (top is null) return;
+        var launcher = top.Launcher;
+        await launcher.LaunchUriAsync(new Uri("https://github.com/irihitech/Semi.Avalonia"));
+    }
+}