title: WPF UIElement.IsHitTestVisible=false; still returning hits?
body: <p>I'm deriving a control from FrameworkElement to use as a container for a VisualCollection, as I'm doing a lot of custom rendering using DrawingVisuals (creating a game map).</p>
  
  <p>I've got a couple different instances of my container layered on top of each other,  and I only want hit testing to affect the layer currently visible,  so I tried doing the obvious, and set .IsHitTestVisible=false, which according to MSDN should prevent any child elements being returned as hit results.  </p>
  
  <p>However, I am still getting hits returned on the containers that are set .IsHitTestVisible=false.
  I've tried everything else I can think of, Collapsed, Hidden, Disabled, 0 Opacity,  nothing seems to take it out of the hit testing.</p>