private Component buildPreferencesTab() {
    VerticalLayout root = new VerticalLayout();
    root.setCaption("Preferences");
    root.setIcon(FontAwesome.COGS);
    root.setSpacing(true);
    root.setMargin(true);
    root.setSizeFull();

    Label message = new Label("Not implemented in this demo");
    message.setSizeUndefined();
    message.addStyleName(ValoTheme.LABEL_LIGHT);
    root.addComponent(message);
    root.setComponentAlignment(message, Alignment.MIDDLE_CENTER);

    return root;
  }
  private Component buildProfileTab() {
    HorizontalLayout root = new HorizontalLayout();
    root.setCaption("Profile");
    root.setIcon(FontAwesome.USER);
    root.setWidth(100.0f, Unit.PERCENTAGE);
    root.setSpacing(true);
    root.setMargin(true);
    root.addStyleName("profile-form");

    VerticalLayout pic = new VerticalLayout();
    pic.setSizeUndefined();
    pic.setSpacing(true);
    Image profilePic = new Image(null, new ThemeResource("img/profile-pic-300px.jpg"));
    profilePic.setWidth(100.0f, Unit.PIXELS);
    pic.addComponent(profilePic);

    Button upload =
        new Button(
            "Change…",
            event -> {
              Notification.show("Not implemented in this demo");
            });
    upload.addStyleName(ValoTheme.BUTTON_TINY);
    pic.addComponent(upload);

    root.addComponent(pic);

    FormLayout details = new FormLayout();
    details.addStyleName(ValoTheme.FORMLAYOUT_LIGHT);
    root.addComponent(details);
    root.setExpandRatio(details, 1);

    firstNameField = new TextField("First Name");
    details.addComponent(firstNameField);
    lastNameField = new TextField("Last Name");
    details.addComponent(lastNameField);

    titleField = new ComboBox("Title");
    titleField.setInputPrompt("Please specify");
    titleField.addItem("Mr.");
    titleField.addItem("Mrs.");
    titleField.addItem("Ms.");
    titleField.setNewItemsAllowed(true);
    details.addComponent(titleField);

    sexField = new OptionGroup("Sex");
    sexField.addItem(Boolean.FALSE);
    sexField.setItemCaption(Boolean.FALSE, "Female");
    sexField.addItem(Boolean.TRUE);
    sexField.setItemCaption(Boolean.TRUE, "Male");
    sexField.addStyleName("horizontal");
    details.addComponent(sexField);

    Label section = new Label("Contact Info");
    section.addStyleName(ValoTheme.LABEL_H4);
    section.addStyleName(ValoTheme.LABEL_COLORED);
    details.addComponent(section);

    emailField = new TextField("Email");
    emailField.setWidth("100%");
    emailField.setRequired(true);
    emailField.setNullRepresentation("");
    details.addComponent(emailField);

    locationField = new TextField("Location");
    locationField.setWidth("100%");
    locationField.setNullRepresentation("");
    locationField.setComponentError(new UserError("This address doesn't exist"));
    details.addComponent(locationField);

    phoneField = new TextField("Phone");
    phoneField.setWidth("100%");
    phoneField.setNullRepresentation("");
    details.addComponent(phoneField);

    newsletterField = new OptionalSelect<>();
    newsletterField.addOption(0, "Daily");
    newsletterField.addOption(1, "Weekly");
    newsletterField.addOption(2, "Monthly");
    details.addComponent(newsletterField);

    section = new Label("Additional Info");
    section.addStyleName(ValoTheme.LABEL_H4);
    section.addStyleName(ValoTheme.LABEL_COLORED);
    details.addComponent(section);

    websiteField = new TextField("Website");
    websiteField.setInputPrompt("http://");
    websiteField.setWidth("100%");
    websiteField.setNullRepresentation("");
    details.addComponent(websiteField);

    bioField = new TextArea("Bio");
    bioField.setWidth("100%");
    bioField.setRows(4);
    bioField.setNullRepresentation("");
    details.addComponent(bioField);

    return root;
  }