title: Add DropShadow to a Custom made Window (Blend)
body: <p>I am creating a custom Window form using <strong>Blend</strong>. (by setting <code>AllowTransparency</code> to <code>True</code>)</p>
  
  <p>I've finished the design and it works pretty well. Now I want to add Shadow effect to it. (<strong>DropShadowEffect</strong>)</p>
  
  <p>I can't do that because the Window itself is hidden so the effect won't show. And it doesn't work on the main Grid. No luck with adding a border and give the shadow to it.</p>