Upgraded to ASP.NET 3.5, Installed VS 2008 and now AJAX problem

Hi all,

I've just upgrade our site to the latest asp.net 3.5 using visual
studio 2008. However, I can not get the AJAX component to work
properly. My application runs fine but it keeps doing a postback on
the whole page when testing AJAX. I tried this Microsoft example as
well and same thing problem. Any idea what could be the problem? It
compiles fine but no


My code was taken from http://asp.net/ajax/documentation/live/ViewSample.aspx?sref= UpdatePan...


My code -----------------------------------------------


<%@ Page Language="C#" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="Test_ajax_Default" %>


"http://
www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">