Here is my test page:
<html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><title>Now</title><script runat=server type="text/C#">public void Submit_Click(object sender,System.EventArgs eventArgs){ this.Title = System.DateTime.Now.ToString();}</script></head><body><form runat="server"><Telerik:RadScriptManager runat=server /><Telerik:RadAjaxManager runat=server EnablePageHeadUpdate=false> <AjaxSettings> <Telerik:AjaxSetting AjaxControlID=Submit> <UpdatedControls> <Telerik:AjaxUpdatedControl ControlID=Submit /> </UpdatedControls> </Telerik:AjaxSetting> </AjaxSettings></Telerik:RadAjaxManager><asp:Button runat=server ID=Submit OnClick=Submit_Click /></form></body></html>
Even if the "EnablePageHeadUpdate" is set to false, the title of the page still change after clicking the button.