public static function createUser($userGroupSID)
 {
     $userGroupSID = SJB_UserGroupManager::getUserGroupSIDByID($userGroupSID);
     $user = new SJB_User(array(), $userGroupSID);
     $user->addUserGroupProperty();
     $user->addRegistrationDateProperty();
     $user->addProductProperty(null, $userGroupSID);
     return $user;
 }