this.add(new RequiredTextField("nom"));
this.add(new RequiredTextField("endroit"));
final TextField debutPicker = new TextField("dateDebut", Date.class);
this.add(debutPicker);
this.add(new DatePicker("debutPicker", debutPicker));
final TextField finPicker = new TextField("dateFin", Date.class);
this.add(finPicker);
this.add(new DatePicker("finPicker", finPicker));
final Map<Parameters, Object> params = new HashMap<Parameters, Object>();
params.put(Parameters.SELECTED_ITEM, null);
params.put(GestionEvenementsPanel.Parameters.IS_NEW, false);