/**
  * Changes the global pagenow to prevent wrong classes on the tab navigation.
  *
  * @return void
  */
 private function set_pagenow()
 {
     $name = $this->config->get_param_name();
     if (!isset($_GET[$name])) {
         return;
     }
     $value = $this->config->get_param_value();
     if ($value !== $_GET[$name]) {
         return;
     }
     $GLOBALS['pagenow'] = $value;
 }