Drag & Drop : DragOver event not raised

[LaurentInSeattle]

When dragging, the DragOver event is not raised on controls that have AllowDrop==true and no background.
After setting the background property to something almost transparent, like: Background="#01010101" , it is back in business...

Took me a long while to figure that out and I tend to think it is a bug...
Or.. What is the rationale for such a behaviour ?

Thanks !

[stevemonaco]

By default, hit testing of (most?) controls fail when the Background is null. No hit test success = no pointer events. You can set to Transparent instead. Rationale should be WPF compatibility and performance.