Reply to two-tone buttons?

i just tacked this question onto another thread, but i don't know if it'll be seen by anybody who knows the answer there. anyway, my question has to do with two-tone buttons. if i'm not mistaken, the two-tone buttons that i've seen in a few pictures around the site appear to be nothing more than a button placed inside a different colored housing. is this correct? my Midifighter has two black buttons and two white buttons and i'd like to make four, two-tone (black/white) buttons. can the buttons be disassembled into two pieces (i.e. the button and the housing)?