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