Get row total price from a configurable product in Magento

I'm writing a payment module, and after the checkout process I'm doing the following to get the price for each product.

foreach($order-&g开发者_JS百科t;getAllVisibleItems() as $item)
{
//...
$price = (float)$item->getData('row_total_incl_tax');
//...

Afaik it works with any kind of product except configurable ones. How can I retrieve the row total for a configurable product?

It seems Mage_Sales_Model_Order_Item has an isChildrenCalculated method. If true you can use getChildrenItemsto either list the simple products individually or loop through them and add up their row totals.