Application_Error(object sender, EventArgs e) is not redirecting to custom page after ajax

hello.

take a look at these:

http://msmvps.com/blogs/luisabreu/archive/2006/10/29/UpdatePanel_3A00_-having-fun-with-errors.aspx

http://msmvps.com/blogs/luisabreu/archive/2006/10/31/Handling-errors-globally.aspx