this.add(dfDtFin);
final ChoiceRenderer choiceRenderer = new ChoiceRenderer("key", "value");
List<BooleanOption> options = new ArrayList<BooleanOption>();
options.add(new BooleanOption("Traité", true));
options.add(new BooleanOption("Non traité", false));
final DropDownChoice dropDownChoice = new DropDownChoice(
"searchByTraite", new PropertyModel(this, "traite"), options,
choiceRenderer);
dropDownChoice.setRequired(true);