public SecondThirdLevelFoldersPanelVc() {
super();
dragController = new ResourceDragController(RootPanel.get(), false, false);
widgetDropController = new SecondThirdLevelFoldersDropController(this);
dragController.registerDropController(widgetDropController);
setDragController(dragController);
}
@Override
public void unregisterDropController() {
dragController.unregisterDropController(widgetDropController);
}