As I was doing my talk on Saturday at the Atlanta Code Camp on data binding at the Atlanta Code Camp, there was a question about the DOM being updated. The question arose wondering if the DOM itself was really being updated. Thanks to Paul Lockwood, he said that Firebug in Mozilla could tell us if it was being updated or not. I pulled out FF 3 with Firebug, opened the page, started to drill through the code, and bang, there was the grid. I did not know that Firebug had that feature. Thanks to Firebug for showing that and thanks to the ASP.NET AJAX team for dynamically updating the DOM.
PS. My buddy Dave Ward told me that it's possible for Firebug to display DOM changes only.