C#

public class MyTestControl : UserControl
{
    private List<SomeClass> myList = new List<SomeClass>();
    SomeClass _mySelectedItem;

    public MyTestControl()
    {
        // populating the list with random stuff. Each instance of SomeClass
        // will override ToString which is what I would like to have show up
        // in the property window (see below)
        myList.Add(new SomeClass());
        myList.Add(new SomeClass());
        myList.Add(new SomeClass());
    }

    [Browsable(true)]
    // what could go here to make this property display all
    // the items of myList as options to choose from in the
    // property window at design time?
    public SomeClass SelectedItem
    {
        get
        {
            return _mySelectedItem;
        }

        set
        {
            _mySelectedItem = true;
        }
    }
}