SR-

I'm not familiar with any compiled reference beyond the CodePlex site (blogs,
forums, etc).  IntelliSense picks up most everything for properties and methods--and
if you want a reference, the Toolkit site has it all (http://www.asp.net/ajax/control-toolkit/live/).


For modifying or creating new extenders: http://www.asp.net/ajax/control-toolkit/live/Walkthrough/CreatingNewExtender.aspx

Beyond that, when you download the toolkit, you can download the full source
with it--open it up in Visual Studio and take a peek.  :)  Quite a bit of
it is community-based (which is a very good thing), so that might lead to
less formal documentation.

-dl

--
David R. Longnecker
http://blog.tiredstudent.com