protected function onAfterDelete()
 {
     parent::onAfterDelete();
     // Delete end
     if (($end = $this->End()) && $end->exists()) {
         $end->delete();
     }
 }
 protected function onAfterDelete()
 {
     parent::onAfterDelete();
     // Delete group
     if (($group = $this->Group()) && $group->exists()) {
         $group->delete();
     }
 }