Save runtime AS3 graphic to FLA Library

Hello,

I have the following Actionscript 3 code which generates a particle grid. If I wanted to modify the code in Flash, run it and then have what is shown in the FLA (a grid of comma shapes) be saved within the FLA in a movieclip how would I do that?

Thanks.

import flash.display.MovieClip;
import flash.events.*;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
 
 
 
var pixelated_mc:MovieClip = new MovieClip();
addChild(pixelated_mc);
pixelated_mc.y = 0;
pixelated_mc.x = 0;
 
var commaHolder_mc:MovieClip = new MovieClip();
commaHolder_mc.y = 0;
commaHolder_mc.x = 0;
//pixelated_mc.addEventListener(MouseEvent.MOUSE_OVER, onRoll);
 
addChild(commaHolder_mc);
 
var pixelSize = 6;
 
 
 
 
function pixelate(){
    var bitmapData:BitmapData = new BitmapData( original_mc.width/pixelSize, original_mc.height/pixelSize, false );
    var bitmap:Bitmap = new Bitmap(bitmapData);
    pixelated_mc.addChild(bitmap);
    var scaleMatrix:Matrix = new Matrix();
    scaleMatrix.scale(1/pixelSize, 1/pixelSize);
    bitmapData.draw( original_mc, scaleMatrix );
bitmap.width = original_mc.width;
bitmap.height = original_mc.height;
tileBG(pixelSize); 
}
 
 
 
 
function tileBG(pixelNum:Number):void { 
 
for(var i=0; i < original_mc.height/pixelSize; i++) {
  for(var j=0; j < original_mc.width/pixelSize; j++) {
	var commaTile_mc = new commaTile();
    commaTile_mc.x = j * commaTile_mc.width;
    commaTile_mc.y = i * commaTile_mc.height;
	commaTile_mc.addEventListener(MouseEvent.ROLL_OVER, onRoll);
	//trace(commaTile_mc.targetPath)
	commaHolder_mc.addChild(commaTile_mc);
	
	
 
  }
}
 
 
}; 
 
removeChild(original_mc);
 
function onRoll(e:MouseEvent):void  {
	
	e.currentTarget.alpha = 0.5;
	trace(e.currentTarget.name);
 
	trace("CLICK");
	
}
 
pixelate();
//pixelated_mc.mask = commaHolder_mc;

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