[cdc7600]

а если использовать Tween?

var tweenEv: Tween = new Tween(yourbitmap,"alpha",Regular.easeInOut,0,1,0.7,true);
tweenEv.addEventListener(TweenEvent.MOTION_FINISH, yourfunction);
 
function yourfunction():void{
var intervalId: uint = setTimeout(Chtodelatdalshe, 1000);
}