/**
  *  check the role of the connected user
  */
 function preDispatch()
 {
     // The parent preDispatch check that a user is connected
     parent::preDispatch();
     // Now, check the role
     if (!$this->user->isReviewer()) {
         // Forward to the "access denied" action
         $this->_forward("accessdenied", "index", "default");
     }
 }