JPAContainer selected item editor vaadin 7.1.10 and ListSelect

Hello,

I have a table with a list of beans returned from database, in JPAContainer.

When i select an Item from the table, i open an editor window with the Selected Item. The entity contains a list of childs. I would like to bind the list of childs to the chids ListSelect and to be able to add/remove items manually (using buttons)

However, nothing is shown in the ListSelect. The name field is bind properly.

private FieldGroup editorForm = new FieldGroup();
@AutoGenerated
private ListSelect childs;
@AutoGenerated
private TextField name;
....

public EditorView(EntityItem<Banca>item) {
editorForm.bind(name, "name");   
editorForm.bind(childs, "childs");   

editorForm.setItemDataSource(entityItem);
}

Thanks