ActionScript 2.0 :: Referencing BitmapData Loaded With MovieClipLoader()?

The starting point is that I load an external PNG file into an open SWF application with the following code:

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var loadListener:Object = new Object();
loadListener.onLoadInit = function():Void {
//do certain actions - not relevant for my question
};

[code]....

That works fine. The problem is how can I later reference to 'flower02.png' as BitmapData which is loaded as a movieClip into the movieClip 'mc1' to execute certain BitmapData methods like in particular 'copyPixels()'?I'm aware that I could use:

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import flash.display.BitmapData;
var libId:String = "flower";
var flowerBmp:BitmapData = BitmapData.loadBitmap(libId);
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In this way I could reference my BitmapData by its variable identifier 'flowerBmp'. But this would require that my 'flower02.png' is already in the library which is not possible for my purpose.