In all the discriptions of API functions that i read they all have constans associated with them, but it never says what values the constans are. I've searched all over the MSDN and I can never seem to find a listing of the constants and their values, alot of times API Viewer doesn't have the constants I need. So if you could just point me in the right direction to find a list like that.... that would be great. And if a list like that doesnt exist then to be more specific im tring to find the constants for the messages for the TreeView control.