Today I read a very long tread about designers in serarch of some solution for this old issue. Since I didn't found an answer that satisfies me and since is really easy avoiding this problem I wrote this simple function:
function addButtonEvent(btn:DisplayObject):void {
MovieClip(btn).buttonMode = true;
MovieClip(btn).mouseChildren = false;
var square:Sprite = new Sprite();
square.graphics.beginFill(0x000000);
var p = btn.getRect(btn.parent);
square.graphics.drawRect(p.x, p.y, p.width, p.height);
btn.parent.addChild(square);
square.visible = false;
MovieClip(btn).hitArea = square;
btn.addEventListener (MouseEvent.MOUSE_OVER, blinkOver);
btn.addEventListener (MouseEvent.MOUSE_OUT, blinkOut);
}
function blinkOver(e:MouseEvent = null) {
Tweener.addTween(e.target, { scaleX:1.08, scaleY:1.08,time:.3 } );
}
private function blinkOut(e:MouseEvent = null) {
Tweener.addTween(e.target, {scaleX:1, scaleY:1,time:.1 } );
}
As you can see the tip is to create a static rectangle over the MovieClip and using it as hitArea.
You just need to call the addButtonEvent function in this way:
addButtonEvent(myMovieclip);
(super simple!!!) Note that for the scaling easing I used Caurina tweener
Some days ago I got an interesting article. An older Nokia 1100 has been bought from hackers, because this telephone has the elusive ability to clone a SIM remotely, which were then used to steal bank codes TAN, (that’s sort of temporary password for access to current accounts). The news is that this phone was sold at $ 25,000, and… I already have this old phone,
So that, I thought... bang!!! Now I sell it and I buy a car. Needless to say, the news is the newest hoax running on the web. 
