DivElement backgroundcolor doesn't work

Hi guys,

Can anyone tell me why the backgroundcolor propery of DivElement doesn't work?

import flashx.textLayout.container.ContainerController;
import flashx.textLayout.elements.ParagraphElement;
import flashx.textLayout.elements.SpanElement;
import flashx.textLayout.elements.TextFlow;
import flashx.textLayout.elements.DivElement;

var textFlow:TextFlow = new TextFlow();

var paragraph:ParagraphElement = new ParagraphElement();
paragraph.fontSize = 16;

var se:SpanElement  = new SpanElement();
se.text                        = "asdf sdf sdf sdf sdfa sdfasdfafds afsdf adsf";

paragraph.addChild(se);

var div:DivElement = new DivElement();
div.addChild(paragraph);
div.backgroundColor = 0xff0000;

textFlow.addChild(div);

var firstController:ContainerController = new ContainerController(this,400,400);
textFlow.flowComposer.addController(firstController);
textFlow.flowComposer.updateAllControllers();

Thanks in advance!

Cheers,

Zsolt