public function memberOf()
  {
    $cgroups = array($this->getParent()->channelGroupGetById($this["client_channel_group_id"]));
    $sgroups = array();

    foreach(explode(",", $this["client_servergroups"]) as $sgid)
    {
      $sgroups[] = $this->getParent()->serverGroupGetById($sgid);
    }

    uasort($sgroups, array(__CLASS__, "sortGroupList"));

    return array_merge($cgroups, $sgroups);
  }