R – How to render a component with dynamic visibility in ActionScript

I have a custom ActionScript component that I'm using in a Flex application (Flex 3.3, ActionScript 3). This component contains an Image control whose visibility is set dynamically based on a property of the data element provided to the component.

The problem is that even when I set the image to be visible, it will not render onscreen. Is there something specific I need to do in order for the image to render? Snippets of relevant code below:

override public function set data( value:Object ):void
{
    _data = value;

    if( _data ) {

        if( _myImg ) {
            _myImg.source = someImageClass;
            _myImg.visible = _data.visibilityProperty;
            _myImg.includeInLayout = _data.visibilityProperty;
            _myImg.invalidateProperties();
            _myImg.invalidateDisplayList();
        }
    }

    invalidateProperties();
    invalidateDisplayList();
}

override protected function createChildren():void
{
    super.createChildren();

    if( !_myImg ) {
        _myImg = new Image();
        _myImg.height = 16;
        _myImg.width = 16;
        addChild( _myImg );
    }
}

override protected function updateDisplayList( unscaledWidth:Number, unscaledHeight:Number ):void
{
    super.updateDisplayList( unscaledWidth, unscaledHeight );

    _myImg.x = calculatedXCoordinate;
    _myImg.y = calculatedYCoordinate;
}