I am dragging a control over a different control as part of a drag/drop operation. AllowDrop is set for both the dragged control and the drop target. There is a DragDrop handler for the drop target, but when I drop on the target, the handler is never called, and nothing happens.

I expect that I am overlooking something simple, but, as might be expected, I can't see it.

When I drag onto a different type of control, it is working correctly, and dragging to the control in question was once working correctly, but not anymore. I did make a bunch of changes, but the fundamental issue is that the dragdrop event is never raised for the control that is the drop target.

What am I missing?