public function buildMenu($config)
    {
        $rootNodes = $this->queryForChildrenOf('NE');

        $options = [['', '']];
        while ($row = $GLOBALS['TYPO3_DB']->sql_fetch_assoc($rootNodes)) {
            $optionTitle = $row['descr'];
            $optionValue = $row['ppn'];
            $options[] = [$optionTitle , $optionValue];
        }

        $config['items'] = array_merge($config['items'], $options);
        return $config;
    }