Composite Control Examples?

Does anyone have any examples of using ASP.NET Ajax with Composite Controls or custom server controls?

Thanks.

3 samples here:

http://alpascual.com/blog/al/archive/2006/06/19/The-power-of-CompositeControl.-Another-skeleton-class-.aspx

http://alpascual.com/blog/al/archive/2006/09/28/Creating-an-Atlas-control-is-not-very-well-described-anywhere_2C00_-centralize-documentation-please_2100_.aspx

http://alpascual.com/blog/al/archive/2006/09/06/Dropdown-with-checkbox-for-ASP.NET-2.0.aspx