public function getRowClass($record)
    {
        $value = '';

        /**
         * @event backend.list.injectRowClass
         * Provides opportunity to inject a custom CSS row class
         *
         * If a value is returned from this event, it will be used as the value for the row class.
         * `$value` is passed by reference so modifying the variable in place is also supported. Example usage:
         *
         *     Event::listen('backend.list.injectRowClass', function($listWidget, $record, &$value) {
         *         $value .= '-modified';
         *     });
         *
         * Or
         *
         *     $listWidget->bindEvent('list.injectRowClass', function ($record, $value) {
         *         return 'strike';
         *     });
         *
         */
        if ($response = $this->fireSystemEvent('backend.list.injectRowClass', [$record, &$value])) {
            $value = $response;
        }

        return $value;
    }