private function _getTransientKey()
{
$_sPageNow = $this->getPageNow();
$_sPageSlug = $this->getElement($_GET, 'page', '');
$_sTabSlug = $this->getElement($_GET, 'tab', '');
$_sUserID = get_current_user_id();
return "apf_fe_" . md5($_sPageNow . $_sPageSlug . $_sTabSlug . $_sUserID);
}