Help for dataSource

I'm using dataSource to retrive data from a remote url. The result set of the remote url is a javascript object. This is the code that I'm using:

<b:dataSource name="items" method="GET" type="array" url="getres.php?action=get_all_items" dataRoot="items" />

My questions are:

1- Where dataSource stores the javascript object returned from the url?
2- How can I manipulate the javascript object to render its content?

Can someone help me please?!

Help for dataSource

The data binding in 4.1 has be simplified and is included with several examples, reference documentation and conceptual guides in the PDF. 4.1 is due to release in about week.