"Floodfilling" externally loaded clip art with a mask?

I’m working on allowing a user to change the color of a clip art object. They start out externally as transparent PNG’s. But I can prepare them in another format if necessary. My question is, is there any method for changing the color of the object from black to a selected color?

I tried masking a it with a rectangle of a different color, but the full color rectangle shows. Can you mask a Bitmap object with loaded content? Is there another way for this to work?

Thanks for your time.

My code is below, based on what I read at http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00000168.html

import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Loader;
import flash.display.Sprite;
import flash.events.*;
import flash.geom.Point;
import flash.geom.Rectangle;
import flash.net.URLRequest;
import flash.display.Shape;

var request:URLRequest = new URLRequest("http://localhost/mysite/clipart/1.png");

var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler);


function completeHandler(event:Event):void {

	var loader:Loader = Loader(event.target.loader);
	var image:Bitmap = Bitmap(loader.content);
	var square:Sprite = new Sprite();
	square.graphics.lineStyle(1, 0x000000);
	square.graphics.drawRect(0, 0, image.width, image.height);
	square.mask = image;