How do I bind a domain context to a data grid ? Ria Services + Silverlight

Question

These past days I've tried to understand the concept of invoked methods and domain contexts, but some things are still not so clear to me.

In my StudentDomainService I have this method:

[Invoke]
    public IEnumerable<Student> GetStudents()
    {
        return _studentRepository.GetStudents();
    }

This returns a list of students that I want to bind to my datagrid using a viewmodel.

In my StudentViewModel I have:

private StudentDomainContext _studentDomainContext;
private InvokeOperation<IEnumerable<Student>> _students;
public StudentViewModel()
    {
        _studentDomainContext = new StudentDomainContext();
        _students = _studentDomainContext.GetStudents(OnInvokeCompleted, null);
    }

    public void OnInvokeCompleted(InvokeOperation<IEnumerable<Student>> studs)
    {
        if (studs.HasError)
        {
            studs.MarkErrorAsHandled();
        }
        else
        {
            var result = studs.Value;
        }
    }

    public InvokeOperation<IEnumerable<Student>> Students
    {
        get { return _students; }
        set
        {
            _students = value;
            RaisePropertyChanged("Students");
        }

    } 

And in StudentView I have a datagrid and I'm trying to bind to the Students property like this:

ItemsSource="{Binding Students}"

But when I start the application the data grid appears but it's not displaying anything. Can anyone please tell me what I'm doing wrong?

UPDATE I think the problem is that the OnInvokeCompleted() method is not executing on the UI, but I'm not really sure.