Implemented ICommandSource

src/Avalonia.Controls/Button.cs

@@ -30,7 +30,7 @@ namespace Avalonia.Controls
     /// A button control.
     /// </summary>
     [PseudoClasses(":pressed")]
-    public class Button : ContentControl
+    public class Button : ContentControl, ICommandSource
     {
         /// <summary>
         /// Defines the <see cref="ClickMode"/> property.
@@ -492,5 +492,7 @@ namespace Avalonia.Controls
         {
             PseudoClasses.Set(":pressed", isPressed);
         }
+
+        void ICommandSource.CanExecuteChanged(object sender, EventArgs e) => this.CanExecuteChanged(sender, e);
     }
 }

src/Avalonia.Controls/MenuItem.cs

@@ -22,7 +22,7 @@ namespace Avalonia.Controls
     /// A menu item control.
     /// </summary>
     [PseudoClasses(":separator", ":icon", ":open", ":pressed", ":selected")]
-    public class MenuItem : HeaderedSelectingItemsControl, IMenuItem, ISelectable
+    public class MenuItem : HeaderedSelectingItemsControl, IMenuItem, ISelectable, ICommandSource
     {
         /// <summary>
         /// Defines the <see cref="Command"/> property.
@@ -609,6 +609,8 @@ namespace Avalonia.Controls
             SelectedItem = null;
         }
 
+        void ICommandSource.CanExecuteChanged(object sender, EventArgs e) => this.CanExecuteChanged(sender, e);
+
         /// <summary>
         /// A dependency resolver which returns a <see cref="MenuItemAccessKeyHandler"/>.
         /// </summary>