Hiding/disabling UpdatePanel during update

One of the most common tasks in AJAX is disabling UpdatePanel during AJAX call, i.e:



I expected UpdateProgress to do just that. It doesn't. I searched to web but I only found patches that forced using JavaScript with-in my pages.

Finally I found this (from which I took the image above):
http://www.codeplex.com/FlanAjaxControls

Open source, Ajax.Net only extender, that lets you disable the UpdatePanel and display the UpdateProgress over the disabled control during the update. No JavaScript, just add the control and CSS style.