@Override
 public void populate(FormItemRepresentation rep) throws FormBuilderException {
   if (!(rep instanceof ComboBoxRepresentation)) {
     throw new FormBuilderException(
         i18n.RepNotOfType(rep.getClass().getName(), "TextFieldRepresentation"));
   }
   super.populate(rep);
   ComboBoxRepresentation crep = (ComboBoxRepresentation) rep;
   List<OptionRepresentation> options = crep.getElements();
   this.items.clear();
   if (options != null) {
     for (OptionRepresentation option : options) {
       this.items.put(option.getLabel(), option.getValue());
       this.listBox.addItem(option.getLabel(), option.getValue());
     }
   }
   this.listBox.clear();
   addItems(this.items, this.listBox);
   this.name = crep.getName();
   this.id = crep.getId();
   populate(this.listBox);
 }