protected function _redirectReferer($defaultUrl = null)
 {
     if ($this->getRequest()->getModuleName() == "advancedcompare" & in_array($this->getRequest()->getActionName(), array("silentadd", "silentremove", "silentclear"))) {
         $this->redrawsidebarAction();
     } else {
         parent::_redirectReferer($defaultUrl);
     }
 }