Issue when creating bitmap from a movie clip in AS3
import flash.geom.Matrix;
import flash.display.BitmapData;
import flash.display.Bitmap;

var box1:Box = new Box();
box1.x = 100;
box1.y = 20;
addChild( box1 );
box1.scaleX *= -1;

var box2:Box = new Box();
box2.x = 300;
box2.y = 20;
addChild( box2 );

var matrix:Matrix = new Matrix( 1, 0, 0, 1, (box1.width / 2), (box1.height / 2) );

var bitmapData:BitmapData = new BitmapData( box1.width, box1.height, true, 0xFFFFFF);
bitmapData.draw(box1, matrix, null, null, null, true);


var bitmap:Bitmap = new Bitmap( bitmapData );
addChild( bitmap );
bitmap.x = 400;
bitmap.y = 300;

var myMatrix:Matrix = myDisplayObject.transform.matrix;
myMatrix.scale(1,-1);
myDisplayObject.transform.matrix = myMatrix;

var bitmapData:BitmapData = new BitmapData( box1.width, box1.height, true, 0xFFFFFF);
bitmapData.draw(box1, myMatrix, null, null, null, true);

var matrix:Matrix = new Matrix( 1, 0, 0, 1, -(box1.width / 2), (box1.height / 2) );