private void accessibilityPrepare() {

    // Add ARIA roles for accessibility
    Roles.getButtonRole().set(backButton.getElement());
    Roles.getButtonRole().setAriaLabelProperty(backButton.getElement(), "back");

    Roles.getHeadingRole().set(heading.getElement());

    Roles.getMenuRole().set(daysOfWeek.getElement());
    Roles.getMenuRole().setAriaLabelProperty(daysOfWeek.getElement(), "select a departing day");
    Roles.getMenuRole().setTabindexExtraAttribute(daysOfWeek.getElement(), 0);

    Roles.getMainRole().set(times.getElement());
    Roles.getMainRole().set(cameras.getElement());

    Roles.getTabRole().set(timesTab.getElement());
    Roles.getTabRole().setAriaSelectedState(timesTab.getElement(), SelectedValue.TRUE);
    Roles.getTabRole().setAriaLabelProperty(timesTab.getElement(), "times");

    Roles.getTabRole().set(camerasTab.getElement());
    Roles.getTabRole().setAriaSelectedState(camerasTab.getElement(), SelectedValue.FALSE);
    Roles.getTabRole().setAriaLabelProperty(camerasTab.getElement(), "cameras");

    Roles.getProgressbarRole().set(progressIndicator.getElement());
    Roles.getProgressbarRole()
        .setAriaLabelProperty(progressIndicator.getElement(), "loading indicator");

    // TODO Hide pull down until we can figure out how to get VoiceOver to work with it
    Roles.getButtonRole().setAriaHiddenState(pullArrowHeader.getElement(), true);

    accessibilityShowTimes();
  }
 @UiHandler("daysOfWeek")
 protected void onChange(ChangeEvent event) {
   if (presenter != null) {
     MListBox source = (MListBox) event.getSource();
     presenter.onDayOfWeekSelected(source.getSelectedIndex());
   }
 }
  @Override
  public void renderDaysOfWeek(List<String> days) {
    daysOfWeek.clear();

    for (String day : days) {
      daysOfWeek.addItem(dayOfWeekFormat.format(new Date(Long.parseLong(day))));
    }
  }
 @Override
 public void setDayOfWeekSelected(int index) {
   daysOfWeek.setSelectedIndex(index);
 }
 @Override
 public int getDayOfWeekSelected() {
   return daysOfWeek.getSelectedIndex();
 }