private function getChatSettingsForm()
 {
     global $ilSetting, $lng;
     include_once 'Services/Form/classes/class.ilPropertyFormGUI.php';
     $form = new ilPropertyFormGUI();
     $form->setFormAction($this->ctrl->getFormAction($this, 'saveChatOptions'));
     $form->setTitle($lng->txt("chat_settings"));
     if ((int) $ilSetting->get('chat_message_notify_status')) {
         // chat message notification in ilias
         //$rg_parent = new ilRadioGroupInputGUI($this->lng->txt('chat_message_notify'), 'chat_message_notify_status');
         //$rg_parent->setValue(0);
         $ro_parent = new ilCheckboxInputGUI($this->lng->txt('chat_message_notify_activate'), 'chat_message_notify_activate');
         //$rg_parent->addOption($ro_parent);
         #$ro_parent->setValue(0);
         if ((int) $ilSetting->get('chat_sound_status') && ((int) $ilSetting->get('chat_new_invitation_sound_status') || (int) $ilSetting->get('chat_new_message_sound_status'))) {
             // sound activation/deactivation for new chat invitations and messages
             #$rg = new ilRadioGroupInputGUI($this->lng->txt('chat_sounds'), 'chat_sound_status');
             #$rg->setValue(0);
             #$ro = new ilCheckboxInputGUI($this->lng->txt('chat_sound_status_activate'), 1);
             if ((int) $ilSetting->get('chat_new_invitation_sound_status')) {
                 $chb = new ilCheckboxInputGUI('', 'chat_new_invitation_sound_status');
                 $chb->setOptionTitle($this->lng->txt('chat_new_invitation_sound_status'));
                 $chb->setChecked(false);
                 $ro_parent->addSubItem($chb);
             }
             if ((int) $ilSetting->get('chat_new_message_sound_status')) {
                 $chb = new ilCheckBoxInputGUI('', 'chat_new_message_sound_status');
                 $chb->setOptionTitle($this->lng->txt('chat_new_message_sound_status'));
                 $chb->setChecked(false);
                 $ro_parent->addSubItem($chb);
             }
             #$rg->addOption($ro);
             //$ro = new ilRadioOption($this->lng->txt('chat_sound_status_deactivate'), 0);
             //$rg->addOption($ro);
             #$ro_parent->addSubItem($rg);
             //$form->addItem($rg);
         }
         #$ro_parent = new ilRadioOption($this->lng->txt('chat_message_notify_deactivate'), 0);
         #$rg_parent->addOption($ro_parent);
         $form->addItem($ro_parent);
     }
     $form->addCommandButton("saveChatOptions", $lng->txt("save"));
     return $form;
 }