My site master page contains a single <ajaxToolkit:ToolkitScriptManager> declaration so that the few pages in my site that use an UpdatePanel need not include such a declaration. The downside to this approach is that a bunch of useless MS-Ajax JS is being emitted to the client even when it's not being used.
Is there a way to interrogate the page being rendered to see if it contains any controls dependent on the ToolkitScriptManager, and not render it in that case?
Thanks.