def _popup_rc_menu(self, event):
        """
        Show self._rc_menu as a popup.
        :param event: tkinter event
        """
        try:
            self._rc_menu.post(event.x_root, event.y_root)
        finally:
            self._rc_menu.grab_release()

        Show self._rc_menu as a popup.
        :param event: tkinter event
        
system/shui/tkui.py