public void addHandler(final PTInstruction addHandler, final UIService uiService) {
if (HANDLER.KEY_.DATE_VALUE_CHANGE_HANDLER.equals(addHandler.getString(HANDLER.KEY))) {
final DateBox dateBox = cast();
final TextBox textBox = dateBox.getTextBox();
dateBox.addValueChangeHandler(new ValueChangeHandler<Date>() {
@Override
public void onValueChange(final ValueChangeEvent<Date> event) {
triggerEvent(addHandler, uiService, dateBox);
}