diff --git a/QuickLook/ViewerWindow.xaml.cs b/QuickLook/ViewerWindow.xaml.cs
index bb6ff76..d3d09b2 100644
--- a/QuickLook/ViewerWindow.xaml.cs
+++ b/QuickLook/ViewerWindow.xaml.cs
@@ -158,12 +158,6 @@ public partial class ViewerWindow : Window
         base.Close();
     }
 
-    protected override void OnSourceInitialized(EventArgs e)
-    {
-        base.OnSourceInitialized(e);
-        ApplyWindowBackgroundEffects();
-    }
-
     public override void OnApplyTemplate()
     {
         base.OnApplyTemplate();
@@ -173,6 +167,13 @@ public partial class ViewerWindow : Window
         ApplyWindowBackgroundEffects();
     }
 
+    protected override void OnContentRendered(EventArgs e)
+    {
+        base.OnContentRendered(e);
+
+        ApplyWindowBackgroundEffects();
+    }
+
     private void ApplyWindowBackgroundEffects()
     {
         var useTransparency = SettingHelper.Get("UseTransparency", true)