Linked Containers problem

Hi,

I'm trying to have text flowing in multiple containers. Those container are created in ActionsScript. When a new RichEditableText is created, I'm doing this:

public function addTextContainerl(newText:RichEditableText):void
{
            var newPageController:ContainerController = new ContainerController( newText );
            newPageController.setCompositionSize( newText.width, newText.height);
            var firstControllerFormat:TextLayoutFormat = new TextLayoutFormat();
            firstControllerFormat.paddingTop = 4;
            firstControllerFormat.paddingRight = 4;
            firstControllerFormat.paddingBottom = 4;
            firstControllerFormat.paddingLeft = 4;
            newPageController.format = firstControllerFormat;
            textFlow.flowComposer.addController(newPageController);
           
            //  Draw the text, and make it editable
            textFlow.flowComposer.updateAllControllers();
            textFlow.interactionManager = new EditManager();
}

Before that, when the application is initialized, I do:

textFlow  = TextConverter.importToFlow(markup, TextConverter.TEXT_LAYOUT_FORMAT);
textFlow.flowComposer = new StandardFlowComposer();

textFlow is a private var, and markup is a string with some formatted text.

It works ok (the text renders and flows), but if I click on one of the RichEditableText one of two things happen:

1. The text disapears.

2. I got this error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at flashx.textLayout.edit::SelectionManager$/computeSelectionIndexInContainer()

Any ideas?