/**
  * Performs logout.
  */
 public function logout()
 {
     /**
      * @var $tree   ilTree
      * @var $ilCtrl ilCtrl
      */
     global $tree, $ilCtrl;
     /**
      * @todo logout user from room
      */
     $pid = $tree->getParentId($this->gui->getRefId());
     $ilCtrl->setParameterByClass('ilrepositorygui', 'ref_id', $pid);
     $ilCtrl->redirectByClass('ilrepositorygui', '');
 }