/**
  * 
  * showEditGroupUsers
  * 
  * @param String $ErrorString
  * @param String $StatusString
  */
 public function showEditGroupUsers($ErrorString = "", $StatusString = "")
 {
     if (Controler_Main::getInstance()->getUserLevel() < BACKEND_USERLEVEL) {
         $ControlerStart = new Controler_Start();
         $ControlerStart->start();
         return false;
     }
     $Request = new Request();
     $ID = $Request->getAsInt("UserGroupID");
     $UserGroup = UserGroup::getEmptyInstance();
     $UserGroupFinder = new UserGroupFinder();
     $UserGroup = $UserGroupFinder->findById($ID);
     $UserFinder = new UserUserFinder();
     $UserCollection = $UserFinder->findAll();
     $Template = Template::getInstance("tpl_BE_GroupUsers.php");
     $Template->assign("UserGroup", $UserGroup);
     $Template->assign("UserCollection", $UserCollection);
     $Template->assign("GroupId", $ID);
     $Template->assign("ErrorString", $ErrorString);
     $Template->assign("StatusString", $StatusString);
     $Template->render();
 }