/**
  * override to allow user loginUrl to be reset for mobile
  * @return void
  */
 public function filterAccessControl($filterChain)
 {
     $user = Yii::app()->getUser();
     if ($user != null) {
         $user->loginUrl = $this->createUrl('site/login/');
     }
     parent::filterAccessControl($filterChain);
 }