title: WPF DropShadowEffect with AllowsTransparency="True"
body: <p>I want to create Non-Rectangular Window with <code>DropShadowEffect</code> on it. I found <a href="http://weblogs.asp.net/psheriff/archive/2009/10/27/create-a-login-window-in-wpf.aspx" rel="nofollow noreferrer">this</a> article how to do this. However <code>DropShadowEffect</code> is not shown when running this code. On screenshots you can see that <code>DropShadowEffect</code> is present, but it's not working for me.</p>
  
  <p>How I can use <code>DropShadowEffect</code> with <code>AllowsTransparency</code> set to True?</p>