[maemo-developers] Unmap default action of hardwarbuttons [was Fremantle fullscreen mode]

[From: ds]

Cornelius Hald gave the following tip: 
> They key constants for the +/- keys are the same as on Diablo. But 
> before you can use them you first have to unmap the default action, 
> which is sound volume up/down.

How do I unmap the default action?? I could not find it in the
documentation:-(

Thanks a lot

Detlef