Can I determine if mouse button is already pressed to change cursor?

Question

I am enabling drag and drop for one control in my SL 5 OOB app.

However, when the user is dragging a file, the cursor is the "copy file' cursor everywhere over my app.

Can I determine if, when the cursor enters my app, the left mouse button is down, and change the cursor appropriately (droppable or not droppable)?

Thanks for any insights...