ComboBoxMultiselect SORT

How I can change sort in the ComboBoxMultiselect?

public class Client(){
    private Long id;
    private String name;

    ....

     //maybe
    @Override
    public String toString() {
        return this.getId() + " - " + this.getName();
    }
}

List<Client> clientes = new ArrayList<Client>();
list.add(new Client(1L, "Java"));
list.add(new Client(2L, "Bonprix"));
list.add(new Client(10L, "Addon"));
list.add(new Client(20L, "Addon"));
list.add(new Client(21L, "Addon"));
list.add(new Client(100L, "Addon"));
list.add(new Client(101L, "Addon"));

BeanItemContainer<Client> container = new BeanItemContainer<>(Client.class);
container.addAll(clientes);
container.sort(new Object { "id" }, new boolean { true });
combobox.setContainerDataSource(container);

or 

combobox.addItems(clientes);

1
10
100
101
11
2
20
21

Adding an own comparator is now available in version 1.1.4 :)

use setComparator(...) and you can use the getSelectedValueOrder(Object o1, Object o2) from the ComboBox itself to get a regular sorting of the selected and unselected items.

btw sorry for the late responds time...

Please I nead more help. I know that you have give answer for the sort "problem" but for me it wasn't clear.
Simple I am using BeanIteamContainer like your example and i don't want any sort. How can i do this?
And also how can i get the selected values of the combo.

Thanks again for this great Component.

Rgds
Elias
 

any solution? i'm still unable to sort items even when my bean container is sorted