So I downloaded the latest AJAX Control Toolkit Bits from Codeplex and installed the VS-Templates as well.
But, no sample code was working on my machine (VISTA, VS.NET 2005 SP1, IE7 and FF2)!
I've got always the following Script-Error: "Sys is undefined" (Sys is one of the major "classes" of the MS AJAX Library). It seems, that the browser is not able to detect the Script-Library, where this object is located.
I've checked the references to the AjaxToolkit.dll, did all the config mentioned in this thread (http://forums.asp.net/1516718/ShowThread.aspx) - no success.
If you google for "Sys is undefined" "AJAX" you will find loads of post about this problems. Seems to exist since ages...
At least, when I'm running the sample on a Windows XP (with IE7), everything work as expected. --> expected means correct!! :-)