>Is it possible to drag a control, say a combo, from a form on to a grid? How about the reverse, drag a control from a grid's column on to a form?
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>If it's no possible to drag, it there some way to effectively cut/paste an existing control from a form to a grid column, or vice-versa?

Do you mean in run-time or design time? If the first, you may check Nick Neklioudov's GridDragDropper class from Downloads section here.