MVP, UIBuilder and View update from the code

Hello,

         I have View created by UIBuilder withing MVP framework. After it is displayed I would like to swap some elements from the java code upon event. I was able to get widget  and remove it by executing:

        Widget w = rootPane.getWidget(1);
        rootPane.remove(w);

          If I try to add element using code like:

        rootPane.addSouth (new HTML("south"), 5);

          entire view becomes blank. I have tried different ways of adding elements, but it seems I can't add them directly. Entire view is corrupted. What am doing wrong?

Thanks

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