// var mc = new MovieClip();
// var btn = new SimpleButton();
// this.addChild(mc);
// mc.parent;
[object MainTimeline]
// this.numChildren;
1
// btn.upState;
null
//btn.upState = mc;
// mc.parent;
null
// this.numChildren;
0
// btn.upState;
[object MovieClip]
// this.addChild(mc);
// mc.parent;
[object MainTimeline]
// this.numChildren;
1
// btn.upState;
[object MovieClip]
