UILoader - drag not updating properties

programming flash
1

Assuming a UILoader instance named “myLoader” is on the stage, consider the following code:

myLoader.load(new URLRequest("http://www.colegrp.com/DI_Avatar.jpg"));

myLoader.addEventListener(MouseEvent.MOUSE_DOWN, handleMouseDown);
myLoader.addEventListener(MouseEvent.MOUSE_UP, handleMouseUp);

function handleMouseDown(evt:MouseEvent):void {
    trace("b1: " + myLoader.x + "," + myLoader.y);
    trace("b2: " + myLoader.content.x + "," + myLoader.content.y);
    myLoader.startDrag();
}

function handleMouseUp(evt:MouseEvent):void {
    myLoader.stopDrag();
    trace("a1: " + myLoader.x + "," + myLoader.y);
    trace("a2: " + myLoader.content.x + "," + myLoader.content.y);
}

Dragging the picture around doesn’t seem to update the x & y properties. The picture has clearly moved, though I can find no values that reflect the change.

??