Thanks for your answers this far.

I have another question. I want the default action, when drag-and-dropping on my QTreeWidget, to be a "move" action instead of a "copy". I know if I hold shift while dragging, it will do a "move" action but I can't find where this decision is made.

Can anyone direct me to the function(s) that I need to work with here?

Thank you very much.

PS: I am using Qt 4.2.2