// First, create an array:
var myArray:Array = new Array(mySymbol1, mySymbol2, mySymbol3);

// This code will move mySymbol1 to the very front
mySymbol1.swapDepths(this.getNextHighestDepth());

// This code will move the second item in the array to the very front
myArray[1].swapDepths(this.getNextHighestDepth());

// This code will move the third item in the array to the very front when the user clicks on mySymbol1
mySymbol1.onRelease = function() {
   myArray[2].swapDepths(this._parent.getNextHighestDepth());
}

// First, create an array:
var myArray:Array = new Array(mySymbol1, mySymbol2, mySymbol3);

// This code will move mySymbol1 to the very front
this.setChildIndex(mySymbol1, this.numChildren - 1);

// This code will move the second item in the array to the very front
this.setChildIndex(myArray[1], this.numChildren - 1);

// This code will move the third item in the array to the very front when the user clicks on mySymbol1
mySymbol1.addEventListener(MouseEvent.CLICK,swapDepths);

function swapDepths(e:Event):void {
	this.setChildIndex(myArray[2], e.target.parent.numChildren - 1);
}