@Override
      public void drop(DnDEvent aEvent) {
        setBorderPainted(false);
        if (aEvent.getAttachedObject() instanceof PaletteItem) {
          myGroup.handleDrop(myPaletteWindow.getProject(), (PaletteItem) aEvent.getAttachedObject(), -1);
        }
      }
@Override
      public void drop(DnDEvent aEvent)