feat: WIP dialog window.

src/Ursa/Controls/Dialog/DialogWindow.cs

@@ -0,0 +1,30 @@
+using Avalonia.Controls;
+using Avalonia.Controls.Metadata;
+using Avalonia.Controls.Primitives;
+
+namespace Ursa.Controls;
+
+[TemplatePart(PART_CloseButton, typeof(Button))]
+public class DialogWindow: Window
+{
+    public const string PART_CloseButton = "PART_CloseButton";
+    
+    protected override Type StyleKeyOverride { get; } = typeof(DialogWindow);
+
+    private Button? _closeButton;
+
+    protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+    {
+        base.OnApplyTemplate(e);
+        _closeButton = e.NameScope.Find<Button>(PART_CloseButton);
+        
+        if (_closeButton != null)
+        {
+            _closeButton.Click += (sender, args) =>
+            {
+                Close();
+            };
+        }
+        
+    }
+}