Dynamic Loaded Smooth Bitmaps lose transparency

programming flash
1

i need some help. I am loading some bitmaps(transparent pngs) that i want to scale and remain smooth. we all know the problems with flash player 8+ anti-aliasing the images and not allowing the images to be forced to be smoothed.

before i get to the code, here is my problem. i want the png to retain its transparency. I use flash8 actionscript 2. Do you can help me? Here is the code


var mclis:Object = new Object();
    //An object that listens for a callback notification from the MovieClipLoader event handlers.
    mclis.onLoadInit = function(target_mc:MovieClip) {
        thisHeightInit = target_mc._height;
        thisWidthInit = target_mc._width;
        // action for smoothed bitmap
       var bitmap:BitmapData = new BitmapData(target_mc._width, target_mc._height, true);
       target_mc.attachBitmap(bitmap, target_mc.getNextHighestDepth(), "auto", true);
       bitmap.draw(target_mc);
        // end action for smoothed bitmap
        calculateProportion(target_mc);
    };