I put a new example online that will show the use of WebControls and ASCX files: Examples/Special/controls.aspx [1]
There is also a keypress demo at Examples/Special/keypress.aspx [2] and onLoading example at Examples/Special/onloading.aspx [3].
The latest version of the Ajax.NET Professional library is 5.11.4.1 5.3.11.5 , download it free at http://www.schwarz-interactive.de [4] including the demo application in .NET 1.1 and 2.0 [5]. The VB.NET version is coming next days.