Handle keyevents while DoExternalDrop is on

Can any body help me how to Handle or capture keys pressed while
dragging is under process.
I need to handle keys. While dragging an object press ctrl key is giving some uneven result , can anybody help me in handle or disable those keys
Thanks in Advance

Within a GoView, a Control-drag-and-drop is supposed to make a copy of the selection instead of just moving the selection.

An external drop (i.e. a drag-and-drop that originated in another Control) is assumed to be a copy, so the Control key should have no effect.
Can you describe what "uneven results" you are getting?