QTreeWidget & drag&drop

Hi,
I want to enable drag&drop on my QTreeWidget, to enable the user to reorder items with d&d. I do not need to interact with other widgets or applications. Also i dont want to copy items, i just want to move them. According to the documentation:
http://doc.qt.nokia.com/4.7/model-vi...venience-views

this code of mine should do:

Code:

---

pTreeWidget::pTreeWidget(QWidget* p)
   : QTreeWidget(p)
{
   setDragEnabled(true);
   setDropIndicatorShown(true);
   viewport()->setAcceptDrops(true);
 
   setDragDropMode(QAbstractItemView::InternalMove);
}

---

(i didnt subclass the widget for d&d, but for another purpose)

While i can grab items & drag them, and the drop indicator is also shown, nothing will happen when i drop the item.

Can someone help me & tell me whats missing?