private function setSortingOptions()
{
// default URL
if (BackendModel::getContainer()->get('url')) {
$this->setURL(BackendModel::createURLForAction(null, null, null, array('offset' => '[offset]', 'order' => '[order]', 'sort' => '[sort]'), false));
}
// sorting labels
$this->setSortingLabels(BackendLanguage::lbl('SortAscending'), BackendLanguage::lbl('SortedAscending'), BackendLanguage::lbl('SortDescending'), BackendLanguage::lbl('SortedDescending'));
}