the first thing to do is compile sharp develop, once youve done that run it and open the sharpdevelop combine, it will list some components in the project browser, i cant remember which part its in, but its fairly obvious its one of the editor projects (either text editor or default editor). I suggest you open a .cs file in the editor to see what it can do and see how complicated it all is! i pretty much gave up on it but if you do find anything of use (even a hint or two) or manage to develop a basic component i would be massivly greatful if you could share some of the mroe complicated areas with me :)
