/**
  * sets a special css class so that this list will be rendered horizontally.
  *
  * @return this instance for chaining.
  */
 public BootstrapListView<T> horizontal() {
   listBehavior.horizontal();
   return this;
 }
 /**
  * whether to us styles or not for ul tags.
  *
  * @return this instance for chaining
  */
 public BootstrapListView<T> unstyled() {
   listBehavior.unstyled();
   return this;
 }