/**
  * Get specified tab grid
  */
 public function gridOnlyAction()
 {
     if ($this->getRequest()->getParam('gridOnlyBlock') == 'maintainer') {
         $this->_initProduct();
         $this->loadLayout();
         $this->getResponse()->setBody($this->getLayout()->createBlock('package/adminhtml_catalog_product_edit_tab_' . $this->getRequest()->getParam('gridOnlyBlock'))->toHtml());
     } else {
         parent::gridOnlyAction();
     }
 }