Scaling JPG to MovieClip container

1

I´m loading a JPG image into an empty movie clip as an Holder.

I want to scale the JPG to the Holder´s size.

Loading is not a problem, scaling neither, but …

to get the loaded JPG _width and _heigth is burning my mind :m:

below is the code section I´m using inside an class

                
var imgHolder = detail.createEmptyMovieClip ("imgHolder", detail.getNextHighestDepth ());
 
var my_mcl:MovieClipLoader = new MovieClipLoader ();

// Create listener object:
var mclListener:Object = new Object ();
mclListener.onLoadError = function (target_mc:MovieClip, errorCode:String, status:Number)
{
      trace ("Error loading image: " + errorCode + " [" + status + "]");
  };
 mclListener.onLoadStart = function (target_mc:MovieClip):Void 
{
      trace ("onLoadStart: " + target_mc);
 };
mclListener.onLoadProgress = function (target_mc:MovieClip, numBytesLoaded:Number, numBytesTotal:Number):Void 
{
     var numPercentLoaded:Number = numBytesLoaded / numBytesTotal * 100;
    trace ("onLoadProgress: " + target_mc + " is " + numPercentLoaded + "% loaded");
  };
  mclListener.onLoadComplete = function (target_mc:MovieClip, status:Number):Void 
  {
     trace ("onLoadComplete: " + target_mc._width + "  " + target_mc._height);
   };
my_mcl.addListener (mclListener);
my_mcl.loadClip ("cristo.jpg", imgHolder);

I thougth I could get target_mc._width and target_mc._height after the Load is complete and then apply the proper xscale and yscale to imgHolder but I get ZERO for both.

What am I doing wrong ?

Thanks any help
João Carlos
Rio
Brazil