Hey guys/gals. I have a silverlight 2 app that has an ObservableCollection of a class from a separate assem/lib. When I set my ListBox.ItemsSource on that collection, and run it, I get the error code: 4004 "System.ArgumentException: Value does not fall within the expected range." Here is part of the code:

public partial class Page : UserControl
{
    ObservableCollection<Some.Lib.Owner> ooc;

    public Page()
    {

        ooc = new ObservableCollection<Some.Lib.Owner>();
        Some.Lib.Owner o1 = new Some.Lib.Owner() { FirstName = "test1" };
        Some.Lib.Owner o2 = new Some.Lib.Owner() { FirstName = "test2" };
        Some.Lib.Owner o3 = new Some.Lib.Owner() { FirstName = "test3" };
        ooc.Add(o1);
        ooc.Add(o2);
        ooc.Add(o3);

        InitializeComponent();
        lb1.ItemsSource = ooc;
    }
}

But when I create the Owner class within this same project, everything works fine. Is there some security things going on behind the scenes? Also, I'm using the generate a html page option and not the aspx option, when I created this Silverlight 2 app.