public void renewCmbValues(Component comp) { // call when an item state changes in Cmb
    DBFeatureValues values = null;
    if (comp != null && cmbFeatures.getSelectedItem() != null) {
      // try{
      values =
          FeatureManager.getFeatureValues(comp.getName(), cmbFeatures.getSelectedItem().toString());
      // }catch(Exception e){}
      unlockComponents();

      // remove listeners first so that changing the values in combo box will not trigger saves
      removeCmbValuesListeners();

      cmbValues.removeAllItems();
      if (values != null) {
        for (String value : values.getValues()) {
          cmbValues.addItem(value);
        }
        cmbValues.setSelectedItem(
            comp.getFeature(cmbFeatures.getSelectedItem().toString()).getValue());
      }

      cmbValues.addItemListener(saveFeatureListener);
    }
  }