title: Is it possible to get the Hwnd of a WPF Popup control?
body: <p>I need to apply an Aero background blur to only part of a custom-shaped WPF window. The problem is that to apply the blur with DWM, I need to provide a window handle to the <code>DwmEnableBlurBehindWindow</code> function. </p>
  
  <p>I have been told that the WPF popup control is actually a separate window. That is good. Can I get a popup's handle to apply blur to it? If so, how? </p>