public function getObjects(&$obj)
 {
     parent::getObjects($obj);
     if ($this->screen) {
         $screenObj =& $this->screen->getObj();
         $myObj =& $this->getObj();
         if (isset($myObj['screen'])) {
             $screenObj['back'] = $myObj['screen'];
         }
         $this->screen->getObjects($obj);
     }
 }