/**
* Adds a user group.
*
* @param UamUserGroup $oUserGroup The user group which we want to add.
*
* @return null
*/
public function addUserGroup($oUserGroup)
{
$this->getUserGroups();
$this->_aUserGroups['noneFiltered'][$oUserGroup->getId()] = $oUserGroup;
$this->_aUserGroups['filtered'] = array();
}
