public static function handleTagItemsRequest(Tag $Tag)
 {
     $conditions = array('TagID' => $Tag->ID);
     if (!empty($_REQUEST['Class']) && Validators::className($_REQUEST['Class'])) {
         $conditions['ContextClass'] = $_REQUEST['Class'];
     }
     return static::respond('tagItems', array('success' => true, 'data' => TagItem::getAllByWhere($conditions)));
 }