[flexcoders] AS3: Missing Properties when Instantiating a Class Accessed as a Property

[justinstander]

I have the following class which embeds an image as a class:

import mx.core.BitmapAsset;

public class MyClass extends MyBaseClass
{
     [Embed(source="assets/myPNG.png",scaleGridTop=7,
     scaleGridBottom=46,scaleGridLeft=7,scaleGridRight=46)]
     public var myPNG:Class;

     public function MyClass():void{
         super();
         init();
     }

     private function init():void{
         // Example 1:
         // This instance works to supply the embedded image
         // but is missing the scale9Grid property
         var myClass:Class = this["myPNG"];
         var bitmapAsset1:BitmapAsset = new myClass() as BitmapAsset;
         
         // Example 2:
         // This inscae works and is complete with the scale9Grid
         // property supplied through embedding.
         var bitmapAsset2:BitmapAsset = new myPNG() as BitmapAsset;
     }
}

So far the scale9Grid property is missing in Example 1, but I fear 
other properties may be missing as well.

Does anyone know how to correct this problem? Is there a better way 
to dynamically access and instantiate the class myPNG at runtime?