      /**
       * The constants used in this Content Widget.
       */
      public static interface CwConstants extends Constants,
          ContentWidget.CwConstants {
        String cwHyperlinkChoose();

        String cwHyperlinkDescription();

        String cwHyperlinkName();
      }

      /**
       * An instance of the constants.
       */
      private CwConstants constants;

      /**
       * Initialize this example.
       */
      @Override
      public Widget onInitialize() {
        // Add a label
        VerticalPanel vPanel = new VerticalPanel();
        vPanel.add(new HTML(constants.cwHyperlinkChoose()));
        vPanel.setSpacing(5);

        // Add a hyper link to each section in the Widgets category
        ShowcaseConstants allConstants = (ShowcaseConstants) constants;
        vPanel.add(getHyperlink(CwCheckBox.class, allConstants.cwCheckBoxName()));
        vPanel.add(getHyperlink(CwRadioButton.class,
            allConstants.cwRadioButtonName()));
        vPanel.add(getHyperlink(CwBasicButton.class,
            allConstants.cwBasicButtonName()));
        vPanel.add(getHyperlink(CwCustomButton.class,
            allConstants.cwCustomButtonName()));
        vPanel.add(getHyperlink(CwFileUpload.class, allConstants.cwFileUploadName()));

        // Return the panel
        return vPanel;
      }