Configurable products options are empty after moving my cart side bar to header?

I have explained Moving Cart from Right Sidebar to Header in this tutorial. After moving my cart to header I have noticed configurable options are not shown up in header. To display configurable product options do the following.

Edit your "template/checkout/cart/sidebar/default.phtml" file.
Find the line if ($_options = $this->getOptionList()):

Replace with the following

$_product = Mage::getModel('catalog/product')->load($this->getProduct()->getId());
$config = new Mage_Catalog_Helper_Product_Configuration();  
if ($_options = $config->getConfigurableOptions($_item)): 

Thats it. You are done.