I've join a discussion about MenuAdapter VS DropDownList, and continued with Overlay / ZIndex issue with Menu and Form controls
If you looked at this and read the part called Adding "Atlas" Features to an Existing ASP.NET Application, but you also need to use a web service with Atlas, you need to read Using ASP.NET Web Services with "Atlas" Clients
What do you think of this? http://blog.firetree.net/20