@Override 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); } }); textBox.addValueChangeHandler( new ValueChangeHandler<String>() { @Override public void onValueChange(final ValueChangeEvent<String> event) { triggerEvent(addHandler, uiService, dateBox); } }); } else { super.addHandler(addHandler, uiService); } }