protected MCategory findCategory(String id) {
   final List<MCategory> categories = application.getCategories();
   for (MCategory cat : categories) {
     if (id.equals(cat.getElementId())) {
       return cat;
     }
   }
   return null;
 }
 private void createCategories() {
   for (MCategory catModel : application.getCategories()) {
     createCategory(catModel);
   }
 }