code: @UiHandler("m_dateModifiedEndDateBox")
      protected void onDateModifiedEndChange(ValueChangeEvent<Date> event) {
  
          if (event.getValue() != null) {
              m_tabHandler.setDateModifiedEnd(event.getValue().getTime());
          } else {
              // if the field is empty take the max value
              m_tabHandler.setDateModifiedEnd(-1L);
          }
      }
docs: Handles changes of date modified range end box.<p>
  
  @param event the change event