fixed #325

src/Shared/HandyControl_Shared/Controls/Window/GlowWindow.cs

@@ -75,7 +75,7 @@ namespace HandyControl.Controls
             }
         }
 
-        protected virtual IntPtr HwndSourceHook(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        private IntPtr HwndSourceHook(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
         {
             if (msg <= InteropValues.WM_WINDOWPOSCHANGED)
             {
@@ -167,7 +167,7 @@ namespace HandyControl.Controls
 
         protected override void OnSourceInitialized(EventArgs e)
         {
-            var hwndSource = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);
+            var hwndSource = this.GetHwndSource();
             if (hwndSource != null)
             {
                 hwndSource.AddHook(HwndSourceHook);