final FieldsetPanel fs = gridBuilder.newFieldset(getString("search.periodOfModification"));
final DatePanel modifiedStartDatePanel = new DatePanel(fs.newChildId(), new PropertyModel<Date>(filter, "startTimeOfModification"),
DatePanelSettings.get().withSelectPeriodMode(true));
fs.add(modifiedStartDatePanel);
fs.add(new DivTextPanel(fs.newChildId(), " - "));
final DatePanel modifiedStopDatePanel = new DatePanel(fs.newChildId(), new PropertyModel<Date>(filter, "stopTimeOfModification"),
DatePanelSettings.get().withSelectPeriodMode(true));
fs.add(modifiedStopDatePanel);
fs.add(new HtmlCommentPanel(fs.newChildId(), new Model<String>() {
@Override
public String getObject()