def _main_button_select( self, event = None ) :
        """internal routine - posts the main menu then runs any associate
        command"""

        self.post( None, True )
        if self._mainbutton_kw.get( 'command', None ) is not None :
            self._mainbutton_kw[ 'command' ]()
internal routine - posts the main menu then runs any associate
        command
recipes/Python/442500_ExtraMenu__TkInter_menu_arbitrary_widgets/recipe-442500.py