BorderLayout using Ext GWT - LayoutRegion.SOUTH displays NORTH

I'm trying to simply reproduce the sample of BorderLayout on the Sencha website, but the South region won't show up in FF. Here is my following code:

package com.google.gwt.test.client;

import com.extjs.gxt.ui.client.Style.LayoutRegion;
import com.extjs.gxt.ui.client.Style.Scroll;
import com.extjs.gxt.ui.client.util.Margins;
import com.extjs.gxt.ui.client.widget.ContentPanel;
import com.extjs.gxt.ui.client.widget.LayoutContainer;
import com.extjs.gxt.ui.client.widget.layout.BorderLayout;
import com.extjs.gxt.ui.client.widget.layout.BorderLayoutData;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.RootPanel;


public class Test implements EntryPoint {

    public void onModuleLoad() {
        RootPanel.get().add(new Frame());
    }

    public class Frame extends LayoutContainer {

        protected void onRender(Element target, int index) {  
            super.onRender(target, index);  
            final BorderLayout layout = new BorderLayout();  
            setLayout(layout);  
            setStyleAttribute("padding", "10px");  

            ContentPanel north = new ContentPanel();  
            ContentPanel west = new ContentPanel();  
            ContentPanel center = new ContentPanel();  
            center.setHeading("BorderLayout Example");  
            center.setScrollMode(Scroll.AUTOX);  

            FlexTable table = new FlexTable();  
            table.getElement().getStyle().setProperty("margin", "10px");  
            table.setCellSpacing(8);  
            table.setCellPadding(4);  

            center.add(table);  

            ContentPanel east = new ContentPanel();  
            ContentPanel south = new ContentPanel();  

            BorderLayoutData northData = new BorderLayoutData(LayoutRegion.NORTH, 100);  
            northData.setCollapsible(true);  
            northData.setFloatable(true);  
            northData.setHideCollapseTool(true);  
            northData.setSplit(true);  
            northData.setMargins(new Margins(0, 0, 5, 0));  

            BorderLayoutData westData = new BorderLayoutData(Layo开发者_如何学运维utRegion.WEST, 150);  
            westData.setSplit(true);  
            westData.setCollapsible(true);  
            westData.setMargins(new Margins(0,5,0,0));  

            BorderLayoutData centerData = new BorderLayoutData(LayoutRegion.CENTER);  
            centerData.setMargins(new Margins(0));  

            BorderLayoutData eastData = new BorderLayoutData(LayoutRegion.EAST, 150);  
            eastData.setSplit(true);  
            eastData.setCollapsible(true);  
            eastData.setMargins(new Margins(0,0,0,5));  

            BorderLayoutData southData = new BorderLayoutData(LayoutRegion.SOUTH, 100);  
            southData.setSplit(true);  
            southData.setCollapsible(true);  
            southData.setFloatable(true);  
            southData.setMargins(new Margins(5, 0, 0, 0));  

            add(north, northData);  
            add(west, westData);  
            add(center, centerData);  
            add(east, eastData);  
            add(south, southData);  
        }  
    }        
}

You have to give a size to your panel just like:

    final Viewport v = new Viewport();
    v.setLayout(new FitLayout());

    LayoutContainer mf = new LayoutContainer();
    mf.setLayout(new BorderLayout());
    v.add(mf);

    RootLayoutPanel.get().add(v);

you can find more info @ http://www.sencha.com/forum/showthread.php?105117-Border-layout-example-not-working&highlight=BorderLayoutExample

Maybe you can try setting the size of the frame instance:

Frame frame = new Frame();
frame.setSize(1000, 800);
RootPanel.get().add(frame);