Program a button that's inside another button

programming flash
1

The issue is that i want to program a button that shows when i MOUSE_OVER another button, except i can’t get it done. I tryed this way:

import flash.events.;
import fl.transitions.;
import fl.transitions.easing.*;
import flash.ui.Mouse;

stop();
design.addEventListener( MouseEvent.MOUSE_OVER, slideout);
design.addEventListener( MouseEvent.MOUSE_OUT, slide2);
design.popwindow.artdeco2.addEventListener(MouseEvent.CLICK,movetoad);

function slideout (e:MouseEvent):void{
design.designinv.alpha=1;
design.gotoAndStop(2);

}

//if (design.currentFrame==2) {
function movetoad (e:MouseEvent) :void{
gotoAndStop(35);
}
//}

function slide2 (e:MouseEvent) :void{
design.designinv.alpha=0;
}

But it doens’t work :S