[gtkmm] What is the best way to diagnose a non-drop

["Ohrnberger, Erik" <erik_ohrnberger dme net>]

Hi Everyone,

	I was just wondering if there was a good method to diagnosing why
something which you think should be a drag and drop target is not allowing
the drag and drop source to drop there.

	I'm thinking of some calls where the drag and drop source & targets
are compared just to check them.  Any recommendations?

	Thanks,
		Erik.