public function execute()
 {
     $id = waRequest::get('id', 0, waRequest::TYPE_INT);
     $collapsed = waRequest::get('collapsed', 0, waRequest::TYPE_INT);
     if ($collapsed) {
         shopCategories::setCollapsed($id);
         return;
     }
     shopCategories::setExpanded($id);
     if (waRequest::get('tree')) {
         $categories = new shopCategories($id);
         $this->view->assign('categories', $categories->getList());
     }
 }