I am replying to my own post since no one answered the question. I found additional info on this subject: http://www.asp.net/AJAX/Documentation/Live/mref/T_System_Web_UI_AsyncPostBackTrigger.aspx http://msdn.microsoft.com/en-us/library/system.web.ui.postbacktrigger.postbacktrigger.aspx http://www.asp...