The presented behavior is actually not expected in such scenarios. Calling some function in the RadAjax ResponseScripts method is the same as executing this code in the PageLoad client event handler. So it is not necessary to have the used in this function controls added to the RadAjax setting in order to have this works properly. Could you please try setting SetTimeout(0) in the mentioned function and verify if this makes any difference.
Also please avoid opening support and forum tickets for the same issue so the case could be better tracked by some of our support person.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!