GWT tabPanel layout problems

Want to achieve vertical and label styles of tabPanel how to implement a custom , online GWT 's little information, did not find the method , help !!
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official documents do not provide ?
recommend Quguan network demo
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/**
   * This is a demonstration of all stand alone widgets in the cobogw framework.
   * Each widget demo is accessible via the history token.
   */
  public class WidgetsDemo implements EntryPoint {
  
    private VerticalTabPanel panel;
  
    private HashMap tabMap = new HashMap();
    private HashMap mapTab = new HashMap();
  
    /**
     * This is the entry point method.
     */
    public void onModuleLoad() {
      panel = new VerticalTabPanel();
      RootPanel.get("content").add(panel);
      panel.add(RoundedPanelDemo.getLazy(), rt("RoundedPanel"));
      panel.add(ButtonDemo.getLazy(), rt("Button"));
      panel.add(ButtonConfigurator.getLazy(), rt("Button CSS generator", "ButtonConfigurator"));
      panel.add(RatingDemo.getLazy(), rt("Rating"));
      panel.add(VerticalTabPanelDemo.getLazy(), rt("VerticalTabPanel"));
      panel.add(MiscDemo.getLazy(), rt("Misc"));
      panel.addSelectionHandler(new SelectionHandler() {
        public void onSelection(SelectionEvent event) {
          History.newItem(mapTab.get(event.getSelectedItem()), false);
        }
      });
      History.addValueChangeHandler(new ValueChangeHandler() {
        public void onValueChange(ValueChangeEvent event) {
          onHistoryChange(event.getValue());
        }
      });
      String initToken = History.getToken();
  
      if (initToken.length() > 0) {
        onHistoryChange(initToken);
      } else {
        onHistoryChange("RoundedPanel");
      }
    }
    private Widget rt(String tab) {
      return rt(tab, tab);
    }
  
    private Widget rt(String tab, String token) {
      tabMap.put(token, panel.getWidgetCount());
      mapTab.put(panel.getWidgetCount(), token);
      return new RoundedPanel(new Label(tab), RoundedPanel.LEFT); 
    }
  
    private void onHistoryChange(String historyToken) {
      if ("RatingWidget".equals(historyToken) || "Rating".equals(historyToken)) {
        panel.selectTab(tabMap.get("Rating"));
      } else if ("Misc".equals(historyToken) || "Tags".equals(historyToken)) {
        panel.selectTab(tabMap.get("Misc"));
      } else if ("Button".equals(historyToken)) {
        panel.selectTab(tabMap.get("Button"));
      } else if ("ButtonConfigurator".equals(historyToken)) {
        panel.selectTab(tabMap.get("ButtonConfigurator"));
      } else if ("VerticalTabPanel".equals(historyToken)) {
        panel.selectTab(tabMap.get("VerticalTabPanel"));
      } else {
        panel.selectTab(tabMap.get("RoundedPanel"));
      }
    }
  }
  
    public static LazyPanel getLazy() {
      return new LazyPanel() {
        public Widget createWidget() {
          final Widget w = new RatingDemo();
          w.setStyleName("demo-TP");
          return new RoundedPanel(w);
        }
      };
    }

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have provided official documents, but did not find the tabPanel customize the interface guess is to be defined in other places , but do not have the prompt does not know how to start
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top it == !
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has concluded , GWT native components can not be achieved , the need for self- definition, but in smartGWT and ext-gwt components can be achieved in the presence of vertical labels feature