public function actionDelete()
 {
     $object = CBaseManager::getWorkPlanMarkStudyActivity(CRequest::getInt("id"));
     $activity = $object->activity;
     $object->remove();
     $order = 1;
     foreach ($activity->marks as $mark) {
         $mark->ordering = $order++;
         $mark->save();
     }
     $this->redirect("workplanmarksstudyactivity.php?action=index&id=" . $activity->getId());
 }