final HorizontalPanel simulDatePanel = simulDate();
simulDatePanel.setVisible( isScenarioSimulatedDateSet() );
final ListBox choice = new ListBox();
choice.addItem( constants.UseRealDateAndTime() );
choice.addItem( constants.UseASimulatedDateAndTime() );
choice.setSelectedIndex( (executionTrace.getScenarioSimulatedDate() == null) ? 0 : 1 );
choice.addChangeHandler( new ChangeHandler() {
public void onChange(ChangeEvent event) {