@Override
 public void focusLost(FocusEvent e) {
   super.focusLost(e);
   if (e.getSource() == ntDt) {
     try {
       sidebar.config.setParameter(StandardParameter.DT, ntDt.getDoubleValue());
     } catch (ParseException ex) {
       ntDt.setValue(
           sidebar.config.getParameter(StandardParameter.DT, StandardParameter.DEFAULT_DT));
     }
   }
 }
 @Override
 public void propertyChanged(String property, double newValue) {
   super.propertyChanged(property, newValue);
   if (StandardParameter.DT.equals(property)) {
     ntDt.setValue(newValue);
   }
 }
  @Override
  public void addToSidebar() {
    super.addToSidebar();

    sidebar.add(lblDt);
    sidebar.add(ntDt);
    ntDt.addFocusListener(this);
  }
  @Override
  public void removeFromSidebar() {

    sidebar.remove(lblDt);
    sidebar.remove(ntDt);
    ntDt.removeFocusListener(this);

    super.removeFromSidebar();
  }
  @Override
  public void loadDataFromModel() {
    super.loadDataFromModel();

    ntDt.setValue(sidebar.config.getParameter(StandardParameter.DT, StandardParameter.DEFAULT_DT));
  }