/**
  * Set tabs
  * @return 
  */
 protected function setTabs()
 {
     global $ilTabs, $ilUser, $ilCtrl;
     $ilCtrl->setParameter($this, 'user_id', '');
     $ilTabs->addTab('consultation_hours_' . $ilUser->getId(), $this->lng->txt('cal_ch_ch'), $this->ctrl->getLinkTarget($this, 'appointmentList'));
     foreach (ilConsultationHourAppointments::getManagedUsers() as $user_id => $login) {
         $ilCtrl->setParameter($this, 'user_id', $user_id);
         $ilTabs->addTab('consultation_hours_' . $user_id, $this->lng->txt('cal_ch_ch') . ': ' . $login, $this->ctrl->getLinkTarget($this, 'appointmentList'));
     }
     $ilCtrl->setParameter($this, 'user_id', '');
     $ilTabs->addTab('ch_settings', $this->lng->txt('settings'), $this->ctrl->getLinkTarget($this, 'settings'));
     $ilTabs->activateTab('consultation_hours_' . $this->getUserId());
 }