AS3 Convert MovieClip or Display to BitmapData

var shirtImage:BitmapData = new BitmapData(530, 300);

shirtImage.draw(shirtObj);

var imagePreview:MovieClip = new MovieClip();
imagePreview.graphics.beginBitmapFill(shirtImage);
imagePreview.graphics.drawRect(0, 0, 530, 300);
imagePreview.graphics.endFill();

var disableMC:MovieClip = new MovieClip();
layer2.addChild(disableMC);
disableMC.graphics.beginFill(0x000000, 0.75);
disableMC.graphics.drawRect(0, 0, 859, 352);
disableMC.graphics.endFill();
layer1.enabled = false;
TweenMax.to(layer1, 0.25, { blurFilter: { blurX:7, blurY:7, quality:1 }} );
layer2.addChild(imagePreview);
imagePreview.x = 150;
imagePreview.y = 20;
imagePreview.addEventListener(MouseEvent.CLICK, function ()
{
TweenMax.to(layer1, 0.25, { blurFilter: { blurX:0, blurY:0, quality:1 }} );
while( layer2.numChildren > 0 )
layer2.removeChildAt( 0 );
}
);