Наследование: extends Post_Meta_Datastore
 /**
  * Render attribute prevents field containers showing on menu save
  */
 public static function set_instance_for_id($current_menu_item_id, $render = true)
 {
     $active_containers = self::get_containers();
     $suffix = '-' . $current_menu_item_id;
     foreach ($active_containers as $container) {
         if ($container->type != 'Nav_Menu') {
             continue;
         }
         $custom_fields = array();
         $fields = $container->get_fields();
         foreach ($fields as $field) {
             $tmp_field = clone $field;
             // Setup Public properties
             $tmp_field->current_menu_item_id = $current_menu_item_id;
             $tmp_field->initial_name = $tmp_field->get_name();
             // Setup Field ID and Name
             $tmp_field->set_id($tmp_field->get_id() . $suffix);
             $tmp_field->set_name($tmp_field->get_name() . $suffix);
             // Update Datastore instance
             $new_datastore = new Nav_Menu_Datastore();
             $new_datastore->set_id($current_menu_item_id);
             $tmp_field->set_datastore($new_datastore);
             $custom_fields[] = $tmp_field;
         }
         self::$instances[$current_menu_item_id] = Container::factory('nav_menu', $container->id . $suffix)->add_fields($custom_fields)->init($current_menu_item_id, $render);
     }
     return self::$instances[$current_menu_item_id];
 }