Hi.
I've searched on the web and on the forum for hours. I can't figure out how to do this.
Do i need to reprogram my entire project? 
there are many possibilities:
- create your own gui
- use jmedesktop (does not work well on mac os + some other issues)
- use a gui library like fenggui / GBUI or nifty
http://www.jmonkeyengine.com/forum/index.php?topic=13658.0