While doing Drag and Drop operation for items in QTreeView/QTreeWidget, no icon/texts are shown on windows7

At least on WindowsXP, icon/texts for selected rows ( in case row selection policy ) in the QTreeView/QTreeWidget are displayed together with your mouse cursor during drag and drop operation, which is really helpful, but nothing displayed on Windows7.

To reproduce this issue, please follow the steps below.
1. Open Qt Designer and create a form and put QTreeWidget on it.
2. Add some items in the QTreeWidget.
3. Specify dragDropMode for the instance of the QTreeWidget to DragOnly to allow drag & drop operation.
4. Preview the form created above steps and drag some items from the instance of the QTreeWidget.

On windows XP, you'll see the texts of the items during drag and drop, but on windows7 nothing will be displayed.

Regards