Paragraph align

Hello,

I use this code from Livedocs Documentation:

/////////////////////////////////////////////////////////////////////////////////////////////////////////

            var config:Configuration = new Configuration();
            var charFormat:CharacterFormat = new CharacterFormat();
            var paraFormat:ParagraphFormat = new ParagraphFormat();
            charFormat.color = 0x000000;
            charFormat.fontFamily = "Arial, Helvetica, _sans";
            charFormat.fontSize = 12;
            charFormat.kerning = Kerning.ON;
            charFormat.fontStyle = FontPosture.NORMAL;
            paraFormat.textAlign = TextAlign.LEFT;
            paraFormat.direction = Direction.RTL;
            config.textFlowInitialCharacterFormat = charFormat;
            config.textFlowInitialParagraphFormat = paraFormat;
            textFlow = new TextFlow(config);

            var p:ParagraphElement = new ParagraphElement();
            var span:SpanElement = new SpanElement();
            span.text = _Value;
            p.addChild(span);
            textFlow.addChild(p);

            textFlow.flowComposer.addController(new DisplayObjectContainerController(this,130,16));
             textFlow.flowComposer.updateAllContainers();

           textFlow.interactionManager = new EditManager();

/////////////////////////////////////////////////////////////////////////////////////////////////////////

It's OK, but when I change

           paraFormat.textAlign = TextAlign.LEFT;

to

           paraFormat.textAlign = TextAlign.RIGHT;

the textflow becomes not editable and doesn't show text.