you want to customize only context menu or you want to customize items from the context menu ?
Venkat, thank you for responding. I am looking to customize the menu itself by adding my own menu item. I have found the UID I needed by searching the system registry. I was also able to add my item to the menu successfully. I wasn't expecting to have to search the system registry for the UID I needed. I thought that information would have been contained in the ESRI help files, but it's not.
Thanks again for responding but I've already figured this out.