Woocommerce custom cart display in dialog box

I’m developing a theme for woocommerce plugin (2.0.12) in wordpress (3.5.1).

In our woocommerce theme when I want to display cart details by using jQuery dialog loading with ajax. For the ajax code, I’ve used the shortcode for cart.

I want to update the cart contents within the box (with ajax of course). I’ve successfully tracked the cart buttons within the dialog-box and also have submitted the cart-form successfully via ajax within the box. But the updates are not executed.

Here is my ajax code for reference:

<?php
define('WP_USE_THEMES', false);
global $woocommerce;
require('../../../../wp-blog-header.php');
?>
<div class="thedialog" title="Cart Details">
<?php echo do_shortcode('[woocommerce_cart]'); ?>
</div>

http://wordpress.org/extend/plugins/woocommerce/