You know that there is no developement continued on AjaxPro, right?
The author (Michael Schwartz) has suggested everybody to move to ASP.NET Ajax. See his post:
http://weblogs.asp.net/mschwarz/archive/2008/01/04/future-of-ajax-net-professional.aspx
You can still find the examples and how to's here:
http://www.ajaxpro.info/