<p>&nbsp;With the&nbsp;<a target="_blank" style="color: rgb(4, 100, 187); text-decoration: none; font-family: Tahoma, Calibri, Verdana, Geneva, sans-serif; font-size: 13px; " href="http://www.ext.net/download/">0.5.0 release</a>&nbsp;we focused a lot of attention on providing support for the UpdatePanel and now everything should be working great. Actually a few beta testers have commented that the Coolite/Ext controls work better now with the ASP.NET UpdatePanel and provide more flexibility, than the native ASP.NET AJAX controls do.</p>