Need advice in managing a "header" textfield

I’ve got a function, based on the Flash help files called configureHeader();

private function configureHeader():void {
            tfHeader = new TextField();
            tfHeader.autoSize = TextFieldAutoSize.LEFT;
            tfHeader.selectable = false;
            tfHeader.embedFonts = true;
            tfHeader.y = 20;
            var titleFormat:TextFormat = new TextFormat;
            titleFormat.color = 0xFFFFFF;
            titleFormat.font = myFont.fontName;
            titleFormat.size = 48;
            tfHeader.defaultTextFormat = titleFormat;

The application is a multipage kiosk project. It starts with a homepage with no header, then a sub nav with the header, and then it goes one page deeper than that with the same header, but new text.

For the sub page function I call:

tfHeader.text = title;
tfHeader.x = (stage.stageWidth/2) - (tfHeader.width/2);

For the sub-sub page I only call:

tfHeader.text = title;
tfHeader.x = (stage.stageWidth/2) - (tfHeader.width/2);

So as to only repopulate the header text. The question I have is that, when the user touches my “Back” button on the sub-sub page, I again call the function that loads the previously loaded sub page. That means I’m calling the configureHeader() function again… This appears to work the way I want it to, but I notice when tracing the childIndex of the tfHeader TextField that the index keeps increasing.

Will this cause issues? Whats happening to the previously added children? And what happens when/if that index number gets too high? Isn’t there a limit?

Please let me know if I need to worry about this and if so, is there a better way.