How can I put movieclips into an array using AS3

programming flash
1

I want to put each movie clip created with this for loop into an array so that I can load images into each movie clip in a later script.

var total1:int=2;
var spacing:Number = 100;
var box_mc:MovieClip;
for(var but:int = 0; but < total1; but++)
{
box_mc= new Box();
box_mc.instanceName = “box”+but;

box_mc.x = spacing + but*(box_mc.width+spacing);
box_mc.y = 125;
addChild(box_mc);

}

2 
var total1:int=2;
var spacing:Number = 100;
var box_mc:MovieClip;
var boxArray:Array = [];
for(var but:int = 0; but < total1; but++)
{
box_mc = new Box();
boxArray[but] = box_mc;
box_mc.instanceName = "box"+but;

box_mc.x = spacing + but*(box_mc.width+spacing);
box_mc.y = 125;
addChild(box_mc);

}