//this.root;
[object MainTimeline]
//this.root === this;
true
//this.root (Symbol 1)
[object MainTimeline]
//this.root === this.parent;
true
//this.root (Symbol 1)
[object MainTimeline]
//this.root === this.parent;
true
//this.root (Symbol 2)
[object MainTimeline]
//this.root === this.parent;
true
//var s1 = new MovieClip();
//s1.root;
null
//this.addChild(s1);
//s1.root;
[object MainTimeline]
//s1.root === s1.parent;
true
