final FieldsetPanel fs = gridBuilder.newFieldset(getString("timePeriod"));
startDate = new DatePanel(fs.newChildId(), new PropertyModel<Date>(filter, "startTime"), DatePanelSettings.get()
.withSelectPeriodMode(true).withRequired(true));
fs.add(startDate);
fs.setLabelFor(startDate);
fs.add(new DivTextPanel(fs.newChildId(), " - ").setRenderBodyOnly(false));
stopDate = new DatePanel(fs.newChildId(), new PropertyModel<Date>(filter, "stopTime"), DatePanelSettings.get()
.withSelectPeriodMode(true).withRequired(true));
fs.add(stopDate);
{
fs.add(new IconLinkPanel(fs.newChildId(), IconType.REMOVE_SIGN, new ResourceModel("calendar.tooltip.unselectPeriod"), new SubmitLink(