[flexcoders] Custom AS3 component, on stopDrag, everything disappears?

[mrand02]

I have a draggable part of my component (that extends Panel, if it
matters), that seems to work fine while dragging.  I can click on the
titleBar of the Panel and the Panel drags around the screen as you'd
expect a draggable window to do, but after I release the mouse button
and this function here gets called, the entire panel just disappears.
 I've tried stage.invalidate() and evt.updateAfterEvent(), they both
do nothing.  Any suggestions?  Never seen this happen before...

public function onRelease(evt:Event):void
{
        if (_bIsDraggable)
        {
                this.stopDrag();
        }
}