protected function _generateBlockLayoutXML($blockName)
{
if (self::$_layoutXml == null) {
self::$_layoutXml = Mage::app()->getLayout()->getUpdate()->asSimplexml();
}
$sections = self::$_layoutXml->xpath("//block[@name='{$blockName}'] | //reference[@name='{$blockName}']");
$layoutXml = '';
foreach ($sections as $section) {
$layoutXml .= $this->_generateSubBlockLayoutXml($section);
}
$layout = new Mage_Core_Model_Layout();
$layout->getUpdate()->addUpdate($layoutXml);
$layout->generateXml();
$layoutXml = $layout->getXmlString();
return $layoutXml;
}
