When implementing a "move" operation using drag and drop, 
a call to setText("") causes the application to freeze on windows.
If a move was successful (from one textfield to another 
for instance),
the desired behavior would be to erase the text from the first
textfield. 

The following code is taken from a TextField extension that 
implements DragSourceListener:

public void dragDropEnd(DragSourceDropEvent dsde){
     this.setText(""); //application hangs
}