两个Tab：SmartGWT Tab和Another Tab
SmartGWT Tab：gwt tabs，gwt button,gwt logo,more info
Another Tab:
1.
public class GwtShowcaseSample implements EntryPoint {   
  
    public void onModuleLoad() {   
        TabSet tabSet = new TabSet();   
        tabSet.setWidth(580);   
        tabSet.setHeight(400);   
  
        Tab smartTab1 = new Tab("SmartGWT Tab  ", "pieces/16/pawn_blue.png");   
        Canvas tabPane1 = new Canvas();   
        tabPane1.setWidth100();   
        tabPane1.setHeight100();   
        tabPane1.addChild(getGwtTab());   
        smartTab1.setPane(tabPane1);   
  
        Tab smartTab2 = new Tab("Another Tab  ", "pieces/16/pawn_blue.png");   
        smartTab2.setPane(new CountryListGrid());   
        tabSet.setTabs(smartTab1, smartTab2);   
  
        tabSet.draw();   
    }   
  
    private Widget getGwtTab() {   
        DecoratedTabPanel tabPanel = new DecoratedTabPanel();   
        tabPanel.setWidth("550px");   
        tabPanel.setAnimationEnabled(true);   
           
        VerticalPanel vPanel0 = new VerticalPanel();   
        vPanel0.setStyleName("vpDotted");   
        vPanel0.setHeight("500px");   
        vPanel0.setSpacing(15);   
        HTML homeText = new HTML("I am a GWT 'HTML' Widget. Click one of the tabs to see more content.");   
        vPanel0.add(homeText);   
  
        tabPanel.add(vPanel0, "GWT Tabs");   
  
        // Add a tab with an image   
        VerticalPanel vPanel = new VerticalPanel();   
        Image gwtImage = new Image("images/gwt/logo.png");   
        gwtImage.setTitle("I am a GWT Image Widget");   
        vPanel.add(gwtImage);   
  
        VerticalPanel vPanel2 = new VerticalPanel();   
        vPanel2.setSpacing(15);   
        vPanel2.setHeight("500px");   
        Button gwtButton = new Button("GWT  Button",   
                new ClickListener() {   
                    public void onClick(Widget sender) {   
                        SC.say("SmartGWT Dialog");   
                    }   
                });   
        vPanel2.add(gwtButton);   
  
        tabPanel.add(vPanel2, "GWT Button");   
  
        tabPanel.add(vPanel, "GWT Logo");   
  
        // Add a tab   
        HTML moreInfo = new HTML("Tabs are highly customizable using CSS.");   
        tabPanel.add(moreInfo, "More Info");   
  
        // Return the content   
        tabPanel.selectTab(0);   
        tabPanel.ensureDebugId("cwTabPanel");   
        return tabPanel;   
    }   
  
    class CountryListGrid extends ListGrid {   
        CountryListGrid() {   
            setWidth(500);   
            setHeight(184);   
            setAlternateRecordStyles(true);   
            setShowAllRecords(true);   
            setCanDragSelect(true);   
  
            ListGridField countryCodeField = new ListGridField("countryCode", "Flag", 40);   
            countryCodeField.setAlign(Alignment.CENTER);   
            countryCodeField.setType(ListGridFieldType.IMAGE);   
            countryCodeField.setImageURLPrefix("flags/16/");   
            countryCodeField.setImageURLSuffix(".png");   
  
            ListGridField nameField = new ListGridField("countryName", "Country");   
            ListGridField capitalField = new ListGridField("capital", "Capital");   
            ListGridField continentField = new ListGridField("continent", "Continent");   
            setFields(countryCodeField, nameField, capitalField, continentField);   
  
            setData(CountryData.getRecords());   
        }   
    }   
  
}  



2.CountryData 
public class CountryData {   
  
    private static CountryRecord[] records;   
  
    public static CountryRecord[] getRecords() {   
        if (records == null) {   
            records = getNewRecords();   
        }   
        return records;   
    }   
  
    public static CountryRecord[] getNewRecords() {   
        return new CountryRecord[]{   
                new CountryRecord("North America", "United States", "US", 9631420, 298444215, 12360, new Date(1776 - 1900, 6, 4), "federal", 2, "Washington, DC", true, "http", "colonies broke with the"};   
    }   
}