First thing -- scenes in Flash are buggy, so don't use them. Second, it's better practice to use movie clips rather than buttons. Buttons do alot of things that are considered "bad", and movie clips give you far more control over animations and whatnot.
Just make a movie clip and inside it make a new layer, and on the first frame put:
this.onRelease = function(){
// put code here to play next scene or whatever.
}
For more info on the button code, there is a tutorial on my website, or you could search the P2L database for movie clip buttons.
Rather than using scenes, just put a stop action at the end of your first section, and then put your second part (what would be in the next scene) after it and give it a frame label. Have you button gotoAndPlay that label. Works much better than scenes.