/**
  * @see Page::readParameters()
  */
 public function readParameters()
 {
     parent::readParameters();
     // groups ids default value
     $this->staticParameters['groupIDs'] = array();
     // detect user deletion
     if (isset($_REQUEST['deletedUsers'])) {
         $this->deletedUsers = intval($_REQUEST['deletedUsers']);
     }
     // search user from passed groupID by group-view
     if (isset($_GET['groupID'])) {
         $this->staticParameters['groupIDs'][] = intval($_GET['groupID']);
         // do search
         try {
             $this->validate();
             $this->save();
         } catch (UserInputException $e) {
             $this->errorField = $e->getField();
             $this->errorType = $e->getType();
         }
     }
     // language ids default value
     $this->staticParameters['languageIDs'] = array();
 }