@Override
    protected void refresh() {
        if (isDatePickerConfigChanged()) {
            // if the config has changed since the last refresh, rebuild the grid
            setupGrid();
        }

        setDate(getModel().getCurrentMonth());
    }
Returns the ListBox for selecting the year
stroom-core-client-widget/src/main/java/stroom/widget/datepicker/client/DefaultMonthSelector.java