private function maybe_set_slug_and_network_menu_exists_flag() {
            if ( ! empty( $this->_dynamically_added_top_level_page_hook_name ) ) {
                $this->_menu->set_slug_and_network_menu_exists_flag( $this->_menu->has_menu() ?
                    $this->_menu->get_slug() :
                    $this->_slug
                );
            }
        }