plaque.add(NumberValidator.range(1, 99999));
plaque.setType(Integer.class);
licence = new RequiredTextField("licence", new PropertyModel(this.afterInfoSaison, "noLicence"));
final DropDownChoice categorieChoice = new DropDownChoice("categorie", new PropertyModel(this.afterInfoSaison,"categorie"),this.categories.getList(), new CategoryChoiceRender());
this.add(categorieChoice.setRequired(true));
this.add(plaque);
this.add(licence);
this.add(new Label("nom", new PropertyModel(this.personne, "nom")));
this.add(new Label("prenom", new PropertyModel(this.personne, "prenom")));