Okay so ive read all your rambling posts. I see the skineditor is now working for you.
First i would download someone elses skin and look at how it is laid out. I would probably start by using there skin and modify it to your own prefrences.
Maybe you should start by telling everyone what exactly you are trying to do.
Like you are building an electric car? You are puting a carputer in it? You want some user interface for ....?
The basic skins out there for RoadRunner include, music,video, internet, gps, OBDI/II.
There are some GPS based speed measurements, if thats what you need.
You probably need a sensor to be able to measure RPM's from the electric motor. And a voltage meter for the battery.
You are really going to run into less battery power with the carputer running, So the lowest power consuming pc is probably what you want. Which may limit dvd playback.
I have a co-worker that converted his car to electric. He has voltage checks on each battery. not to mention batteries every where. in the engine compartment and in the trunk. He says he gets about 30-60 miles on full a charge but thinks he can get more with better batteries. He has a manual clutch so he can change gears. and i think he said he could get 60mph but im not sure. i saw it last year.
So back to your button problem. What do you want the button to do? Go to another menu?