public function downloadAsText(Mage_Core_Model_Config_Element $configNode)
    {
        $items = array();
        Mage::helper('sheep_debug')->xml2array($configNode, $items);

        $content = '';
        foreach ($items as $key => $value) {
            $content .= "$key = $value\n";
        }

        $this->_prepareDownloadResponse('config.txt', $content, 'text/plain');
    }