def _child_post_and_activate( self, event ) :
        """internal method - post sub-menu when an event occurs
        (mouse, Enter key)."""

        # figure out where we were called from, then post the child
        w = event.widget
        self._child_post( w, True )
internal method - post sub-menu when an event occurs
        (mouse, Enter key).
recipes/Python/442500_ExtraMenu__TkInter_menu_arbitrary_widgets/recipe-442500.py