/**
  * confirm delete files
  *
  * @access public
  * @param
  * @return
  */
 public function confirmDeleteFilesObject()
 {
     $this->tabs_gui->setTabActive('settings');
     if (!count($_POST['file_id'])) {
         ilUtil::sendFailure($this->lng->txt('select_one'));
         $this->editObject();
         return false;
     }
     include_once "Services/Utilities/classes/class.ilConfirmationGUI.php";
     $c_gui = new ilConfirmationGUI();
     // set confirm/cancel commands
     $c_gui->setFormAction($this->ctrl->getFormAction($this, "deleteFiles"));
     $c_gui->setHeaderText($this->lng->txt("info_delete_sure"));
     $c_gui->setCancel($this->lng->txt("cancel"), "edit");
     $c_gui->setConfirm($this->lng->txt("confirm"), "deleteFiles");
     // add items to delete
     foreach ($_POST["file_id"] as $file_id) {
         $file = new ilSessionFile($file_id);
         if ($file->getSessionId() != $this->object->getEventId()) {
             ilUtil::sendFailure($this->lng->txt('select_one'));
             $this->edit();
             return false;
         }
         $c_gui->addItem("file_id[]", $file_id, $file->getFileName());
     }
     $this->tpl->setContent($c_gui->getHTML());
     return true;
 }