http://jquerymobile.com/blog/2013/02/20/jquery-mobile-1-3-0-released/

https://github.com/jquery/jquery-mobile/commit/2e21c6b92a2fc919c46244874de9da7a52173b50

It is now possible to change  button ‘s data-theme programatically via  _setOption .

 

I don't see anything on this in documentation..

http://api.jquerymobile.com/button/

does anybody know how to use this.... ?