Check page http://mapserver.mendelu.cz/wmsbinder where you will find code repository (SVN) to access the  WMS binder sources. We have two designs – old one on http://wmsbinder.mendelu.cz/getCap-old.htm and new one still under progress.  What is hot in new verison is ability to display thumbnails of layers you have attached into the main map window and ability to rearange them and change transparency. Export to MapShake is now working automaticaly from Export tab (using OLON)  (you just need to have valid account on MapShake).  Enjoy ! P.S> I am interchanging WMSBinder with the term MapBinder…not sure which one is better.