public function exportTheme(DataContainer $dc)
	{
		// Get the theme meta data
		$objTheme = $this->Database->prepare("SELECT * FROM tl_theme WHERE id=?")
								   ->limit(1)
								   ->execute($dc->id);

		if ($objTheme->numRows < 1)
		{
			return;
		}

		// Romanize the name
		$strName = Utf8::toAscii($objTheme->name);
		$strName = strtolower(str_replace(' ', '_', $strName));
		$strName = preg_replace('/[^A-Za-z0-9._-]/', '', $strName);
		$strName = basename($strName);

		// Create a new XML document
		$xml = new \DOMDocument('1.0', 'UTF-8');
		$xml->formatOutput = true;

		// Root element
		$tables = $xml->createElement('tables');
		$tables = $xml->appendChild($tables);

		// Add the tables
		$this->addTableTlTheme($xml, $tables, $objTheme);
		$this->addTableTlStyleSheet($xml, $tables, $objTheme);
		$this->addTableTlImageSize($xml, $tables, $objTheme);
		$this->addTableTlModule($xml, $tables, $objTheme);
		$this->addTableTlLayout($xml, $tables, $objTheme);

		// Generate the archive
		$strTmp = md5(uniqid(mt_rand(), true));
		$objArchive = new ZipWriter('system/tmp/'. $strTmp);

		// Add the files
		$this->addTableTlFiles($xml, $tables, $objTheme, $objArchive);

		// Add the template files
		$this->addTemplatesToArchive($objArchive, $objTheme->templates);

		// HOOK: add custom logic
		if (isset($GLOBALS['TL_HOOKS']['exportTheme']) && \is_array($GLOBALS['TL_HOOKS']['exportTheme']))
		{
			foreach ($GLOBALS['TL_HOOKS']['exportTheme'] as $callback)
			{
				System::importStatic($callback[0])->{$callback[1]}($xml, $objArchive, $objTheme->id);
			}
		}

		// Add the XML document
		$objArchive->addString($xml->saveXML(), 'theme.xml');

		// Close the archive
		$objArchive->close();

		// Open the "save as …" dialogue
		$objFile = new File('system/tmp/'. $strTmp);
		$objFile->sendToBrowser($strName . '.cto');
	}