code: private void initDurationPanel() {
  
          m_durationPrefixLabel.setText(Messages.get().key(Messages.GUI_SERIALDATE_DURATION_PREFIX_0));
          m_durationAfterPostfixLabel.setText(Messages.get().key(Messages.GUI_SERIALDATE_DURATION_ENDTYPE_OCC_POSTFIX_0));
          m_seriesEndDate.setDateOnly(true);
          m_seriesEndDate.setAllowInvalidValue(true);
          m_seriesEndDate.setValue(m_model.getSeriesEndDate());
          m_seriesEndDate.getTextField().addFocusHandler(new FocusHandler() {
  
              public void onFocus(FocusEvent event) {
  
                  if (handleChange()) {
                      onSeriesEndDateFocus(event);
                  }
  
              }
          });
      }
docs: Initialize elements from the duration panel.