//var chx = this.getChildAt(0)
//var chy = this.getChildAt(1)
//var chz = this.getChildAt(2)
//this.numChildren
3
//this.addChildAt(chx, 1)
//chy === this.getChildAt(0)
true
//chx === this.getChildAt(1)
true
//chz === this.getChildAt(2)
true
//this.addChildAt(chx, 0)
//chx === this.getChildAt(0)
true
//chy === this.getChildAt(1)
true
//chz === this.getChildAt(2)
true
//this.addChildAt(chz, 1)
//chx === this.getChildAt(0)
true
//chz === this.getChildAt(1)
true
//chy === this.getChildAt(2)
true
//this.addChildAt(chz, 2)
//chx === this.getChildAt(0)
true
//chy === this.getChildAt(1)
true
//chz === this.getChildAt(2)
true
//this.addChildAt(chz, 0)
//chz === this.getChildAt(0)
true
//chx === this.getChildAt(1)
true
//chy === this.getChildAt(2)
true
//this.numChildren
3
