@Override
 public void onHttpError(ResponseStatus responseCode) {
   NotificationUtil.makeText(getActivity(), R.string.toast_unable_to_update_category);
 }
 @Override
 public void onSuccess(Category responseData) {
   getCallback().onCategoryModified(responseData);
   NotificationUtil.makeText(getActivity(), R.string.toast_category_updated);
   destroySelf();
 }