this.add(new TextField("commenditaire", new PropertyModel(this.cart,
"commenditaire")));
final DropDownChoice dropDownChoice = new DropDownChoice("club",
new PropertyModel(this.cart, "clubOid"), this.clubsCtrl
.getClubs(), new ClubChoiceRender());
dropDownChoice.setRequired(false);
this.add(dropDownChoice);
this.add(new Button("payer")
{