[Qt-interest] Drop problem

[RZ]

Hi all,

I'm trying to drag an "item" from one QMainWindow inside an mdi 
application to another mdi application. The target window only contains 
a class derived from QListWidget in which I implemented

dragEnterEvent(QDragEnterEvent *e);
and
dropEvent(QDropEvent *e);

The problem:
I always see the "drop not possible"-sign although my dragEnterEvent 
gets called and in there i do
e->acceptProposedAction();

But the dropEvent _never_ gets called.

It should be quite simple but I have no idea why it fails and - even 
worse - how to debug who blocks my drop?!?

Any ideas welcome,

RZ