I have a requirement to allow the user to drop an object onto the grid even if the grid has no rows. However my callback methods for the AddDragOverHandler and AddDropHandler aren't called if I'm not over a row. How can I get called back in this case?
From your sample I see what I need was to add the property AllowDrop="True". I had added this and IsDragDropEnabled="True" once before and it made my other dragdrop code stop working. However, just adding AllowDrop does exactly what I want. It lets the rest of my dragdrop work and also allows me to drop on an empty grid.