Developer documentation, eh? How about local bookstore, library,
msdn.microsoft.com? And, of course, don't forget to search google.com.

--
Regards,

Tushar Mehta
www.tushar-mehta.com
Excel, PowerPoint, and VBA add-ins, tutorials
Custom MS Office productivity solutions

In article ,
says...
I want to develop custom chart add-ins for Excel. Where can I find some
developer documentation ?

Thanks,
Ram