Theres a super easy way to do stuff like this, its called TweenMax / TimelineMax. You can
download the AS3 version here.
Then lets say you have a movieclip on the stage called mcContainer, which contains 10 other movieclips that you want to fade up. With TimelineMax its done like this:
ActionScript Code:
var tempChild:MovieClip;
var tl:TimelineMax = new TimelineMax({paused: true});
for(var i:int = 0; i < mcContainer.numChildren; i++){
tempChild = mcContainer.getChildAt( i );
tl.append( TweenMax.from( tempChild, 0.5, {autoAlpha: 0, delay: i*0.1} ) );
}
//Then you can play the timeline similar to a movieclip:
tl.play();