Converting ReadOnlyEntityList to EntityList question

   I found the following tech tip but am not 100% clear on what you mean by "Note that your new list is an unmanaged one (unless and until you configure a ListManager for it), so no additional Order objects will get into it unless you expressly put them there."
Can you give me a code example that shows how to "configure a  ListManager for it"?
Thanks!

Converting a ReadOnlyEntityList<T> Into
                                                    an EntityList<T>
                                                 On occasion you may want
                                                to convert your ReadOnlyEntityList<T> into
                                                a list to which you can directly
                                                add or remove entities. You can
                                                do that easily, as follows:

                                            C#:
                                                EntityList<Order> orders
                                                =

                                                                                             new EntityList<Order>(mCurrentEmployee.Orders);

                                                VB.NET:
                                                Dim orders As EntityList(Of Order)
                                                = _

  New EntityList(Of Order)(mCurrentEmployee.Orders)

                                            Now you can add
                                                and remove Orders freely and
                                                directly in your new orders collection.
                                                Note that your new list is an
                                                unmanaged one (unless and until
                                                you configure a ListManager for
                                                it), so no additional Order objects
                                                will get into it unless you expressly
                                                put them there.