private boolean isDatePickerConfigChanged() {
        boolean isMonthCurrentlySelectable = monthSelect.getParent() != null;
        boolean isYearNavigationCurrentlyEnabled = yearBackwards.getParent() != null;

        return getDatePicker().isYearAndMonthDropdownVisible() != isMonthCurrentlySelectable ||
                getDatePicker().isYearArrowsVisible() != isYearNavigationCurrentlyEnabled;
    }
Returns the ListBox for selecting the year
stroom-core-client-widget/src/main/java/stroom/widget/datepicker/client/DefaultMonthSelector.java