/**
  * Sorting controls
  *
  * @return ListSorter sorter
  */
 public function getSorter()
 {
     $options = array();
     foreach (ProductCategory::config()->sort_options as $k => $v) {
         // make the label translatable
         $k = _t("ProductCategory.{$k}", $k);
         $options[$k] = $v;
     }
     $sorter = ListSorter::create($this->request, $options);
     $this->extend('updateSorter', $sorter);
     return $sorter;
 }