def _enter_key( self, event ) :
        """internal routine to run the command associated with a button when
        the Enter key is pressed (used because we rebind this key for the
        widget). Otherwise, the original command might not expect an event"""
        w = event.widget
        self._run_command( w )
internal routine to run the command associated with a button when
        the Enter key is pressed (used because we rebind this key for the
        widget). Otherwise, the original command might not expect an event
recipes/Python/442500_ExtraMenu__TkInter_menu_arbitrary_widgets/recipe-442500.py