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

        String cwCookiesDescription();

        String cwCookiesExistingLabel();

        String cwCookiesInvalidCookie();

        String cwCookiesName();

        String cwCookiesNameLabel();

        String cwCookiesSetCookie();

        String cwCookiesValueLabel();
      }

      /**
       * The timeout before a cookie expires, in milliseconds. Current one day.
       */
      private static final int COOKIE_TIMEOUT = 1000 * 60 * 60 * 24;

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

      /**
       * A {@link TextBox} that holds the name of the cookie.
       */
      private TextBox cookieNameBox = null;

      /**
       * A {@link TextBox} that holds the value of the cookie.
       */
      private TextBox cookieValueBox = null;

      /**
       * The {@link ListBox} containing existing cookies.
       */
      private ListBox existingCookiesBox = null;

      /**
       * Initialize this example.
       */
      @Override
      public Widget onInitialize() {
        // Create the panel used to layout the content
        Grid mainLayout = new Grid(3, 3);

        // Display the existing cookies
        existingCookiesBox = new ListBox();
        Button deleteCookieButton = new Button(constants.cwCookiesDeleteCookie());
        mainLayout.setHTML(0, 0, "<b>" + constants.cwCookiesExistingLabel()
            + "</b>");
        mainLayout.setWidget(0, 1, existingCookiesBox);
        mainLayout.setWidget(0, 2, deleteCookieButton);

        // Display the name of the cookie
        cookieNameBox = new TextBox();
        mainLayout.setHTML(1, 0, "<b>" + constants.cwCookiesNameLabel() + "</b>");
        mainLayout.setWidget(1, 1, cookieNameBox);

        // Display the name of the cookie
        cookieValueBox = new TextBox();
        Button setCookieButton = new Button(constants.cwCookiesSetCookie());
        mainLayout.setHTML(2, 0, "<b>" + constants.cwCookiesValueLabel() + "</b>");
        mainLayout.setWidget(2, 1, cookieValueBox);
        mainLayout.setWidget(2, 2, setCookieButton);

        // Add a listener to set the cookie value
        setCookieButton.addClickListener(new ClickListener() {
          public void onClick(Widget sender) {
            String name = cookieNameBox.getText();
            String value = cookieValueBox.getText();
            Date expires = new Date((new Date()).getTime() + COOKIE_TIMEOUT);

            // Verify the name is valid
            if (name.length() < 1) {
              Window.alert(constants.cwCookiesInvalidCookie());
              return;
            }

            // Set the cookie value
            Cookies.setCookie(name, value, expires);
            refreshExistingCookies(name);
          }
        });

        // Add a listener to select an existing cookie
        existingCookiesBox.addChangeListener(new ChangeListener() {
          public void onChange(Widget sender) {
            updateExstingCookie();
          }
        });

        // Add a listener to delete an existing cookie
        deleteCookieButton.addClickListener(new ClickListener() {
          public void onClick(Widget sender) {
            int selectedIndex = existingCookiesBox.getSelectedIndex();
            if (selectedIndex > -1 && selectedIndex < existingCookiesBox.getItemCount()) {
              String cookieName = existingCookiesBox.getValue(selectedIndex);
              Cookies.removeCookie(cookieName);
              existingCookiesBox.removeItem(selectedIndex);
              updateExstingCookie();
            }
          }
        });

        // Return the main layout
        refreshExistingCookies(null);
        return mainLayout;
      }

      /**
       * Refresh the list of existing cookies.
       *
       * @param selectedCookie the cookie to select by default
       */
      private void refreshExistingCookies(String selectedCookie) {
        // Clear the existing cookies
        existingCookiesBox.clear();

        // Add the cookies
        int selectedIndex = 0;
        Collection<String> cookies = Cookies.getCookieNames();
        for (String cookie : cookies) {
          existingCookiesBox.addItem(cookie);
          if (cookie.equals(selectedCookie)) {
            selectedIndex = existingCookiesBox.getItemCount() - 1;
          }
        }

        // Select the index of the selectedCookie. Use a DeferredCommand to give
        // the options time to register in Opera.
        final int selectedIndexFinal = selectedIndex;
        DeferredCommand.addCommand(new Command() {
          public void execute() {
            // Select the default cookie
            if (selectedIndexFinal < existingCookiesBox.getItemCount()) {
              existingCookiesBox.setSelectedIndex(selectedIndexFinal);
            }

            // Display the selected cookie value
            updateExstingCookie();
          }
        });
      }

      /**
       * Retrieve the value of the existing cookie and put it into to value label.
       */
      private void updateExstingCookie() {
        // Cannot update if there are no items
        if (existingCookiesBox.getItemCount() < 1) {
          cookieNameBox.setText("");
          cookieValueBox.setText("");
          return;
        }

        int selectedIndex = existingCookiesBox.getSelectedIndex();
        String cookieName = existingCookiesBox.getValue(selectedIndex);
        String cookieValue = Cookies.getCookie(cookieName);
        cookieNameBox.setText(cookieName);
        cookieValueBox.setText(cookieValue);
      }