private static function treeGoDown($id, $data, &$hidden)
    {
        foreach ($data as $row) {
            if ($row['parent_id'] == $id) {
                if (false === in_array($row['id'], $hidden)) {
                    $hidden[] = $row['id'];
                }
                self::treeGoDown($row['id'], $data, $hidden);
            }
        }
    }