public function __get($strName)
 {
     switch ($strName) {
         case 'JsReturnParam':
             return $this->strReturnParam;
         default:
             try {
                 return parent::__get($strName);
             } catch (QCallerException $objExc) {
                 $objExc->IncrementOffset();
                 throw $objExc;
             }
     }
 }
 public function __construct($intDelay = 0, $strCondition = null)
 {
     parent::__construct($intDelay, $strCondition, 'input[type="checkbox"]');
 }