protected function addAttributesToRender($writer)
 {
     parent::addAttributesToRender($writer);
     $control = $this->getValidationTarget();
     $JSFile = $this->publishAsset('assets/RequiredMaskedFieldValidator.js');
     $csm = $this->getPage()->getClientScript();
     if (!$csm->isScriptFileRegistered('RequiredMaskedFieldValidator')) {
         $csm->registerScriptFile('RequiredMaskedFieldValidator', $JSFile);
     }
 }