ASP.NET AJAX maintain panel scrolling position

After sometime in developing my Support Chat, I can get the panel scrolling to maintain it scroll position. Doing some Google don’t help much, only finding more complex solutions. A lot of people went with javascript, or something other. Then in the shower, I finally got, I can put the UpdatePanel inside the Panel, and then do the Aync post back. So I tried out my idea, and here the test code