Setting Custom Attributes For Item using GCheckout
<p>I am using .net google checkout utility GCheckout.dll to setup various shopping cart settings and product attributes. every thing is ok but i want to sent custom field information like shirt color, size etc via google checkout button. sample code below</p>

<pre><code>GCheckout.Checkout.ShoppingCartItem item = new GCheckout.Checkout.ShoppingCartItem();
item.Name = "PayCircuit T-shirt";
item.Description = "The best shirt ever";
item.Price = (decimal)9.99;
item.Quantity = 3;
</code></pre>

<p>I can't find how to setup custom field attributes with ShoppingCartItem class.</p>
