public function getUserGroup()
 {
     if (!is_null($this->mUserGroup) && !$this->mUserGroup->IsLoaded()) {
         $this->loadClass('UserGroupDao', 'dao');
         $UserGroupDao = new UserGroupDao();
         $this->mUserGroup = $UserGroupDao->getObject($this->mUserGroup->getId());
         if (!is_null($this->mUserGroup)) {
             $this->mUserGroup->setIsLoaded(true);
         }
     }
     return $this->mUserGroup;
 }