title: Making a control visible to hit-testing but transparent to drag&drop
body: <p>I have an ItemsControl that displays items as polylines and has a transparent background. I want to make this control invisible as a drop-target (so that the control underneath it can receive drag-drop events), but I do want to make it visible for hit-testing so that I can click on the polylines and perform operations on them.</p>
  
  <p>I found the IsHitTestVisible property. However it enables or disables both drag-drop and hit-testing. Is there any way to make the control be "invisible" just as a possible drop target, but leaving it visible for hit-testing and mouse events?</p>
  
  <p>Thanks.</p>
  
  <p><strong>Update</strong></p>
  
  <p>I eventually found out that an ItemsControl, even if its background is transparent, somehow hides the elements underneath it from mouse events. So the problem is not with drag-drop. Do you know how can I make it be really transparent and allow the items underneath it have mouse events?</p>