[FZ Editor] hide tool windows from alt-tab (#10011)

src/modules/fancyzones/editor/FancyZonesEditor/LayoutOverlayWindow.xaml.cs

@@ -2,9 +2,7 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System;
 using System.Windows;
-using System.Windows.Media;
 
 namespace FancyZonesEditor
 {
@@ -17,5 +15,10 @@ namespace FancyZonesEditor
         {
             InitializeComponent();
         }
+
+        private void Window_Loaded(object sender, RoutedEventArgs e)
+        {
+            Utils.NativeMethods.SetWindowStyleToolWindow(this);
+        }
     }
 }