You cant have a black button unless you change the main system font color to a light color but be warned if you do there will always be black text somewhere primarilly when in a web browser,because the web site can call for the push button and either your system font color or they can just say use black text in the html code so on those sites it will always show black text on your black button.
BTW.... that was a master skinner trying to help you and your response was not very polite!