DataBindings: Enum with ComboBox

Hello,

Really I am overheated.
I want to bind SelectedIndex of a Combo to some dataSet.
Actually list for Combo is taken from enum list, which order matches its values and Selected Index of a Combo..

Honestly, I hate this bindings.. because I spend too much time to make it workable, much easier to use old callbacks technique.. anyway the ContextManager does the same.. ))
But this time I want to beat it with your help..

Here is the code..

    public partial class TestWin : Form
    {
        class DataHolder
        {
            protected Types selectedType;
            protected int selectedTypeInt;
            public Types SelectedType
            {
                get { return selectedType; }
                set
                {
                    selectedType = (Types)value;
                    if (OnChanged != null) OnChanged(value);
                }
            }
            public event dOnChanged OnChanged;
            public delegate void dOnChanged(object o);
            public int SelectedTypeInt
            {
                get { return selectedTypeInt; }
                set
                {
                    selectedTypeInt = value;
                    if (OnChanged != null) OnChanged(value);
                }
            }

        }
        public enum Types : int { Type1 = 0, Type2 = 1, Type3 = 2 };
        public TestWin()
        {
            InitializeComponent();
            dh = new DataHolder();
            dh.OnChanged += dh_OnChanged;
            cb = new ComboBox();
            this.Controls.Add(cb);
            cb.Location = new Point(100, 100);
            cb.DropDownStyle = ComboBoxStyle.DropDownList;
            foreach (string name in Enum.GetNames(typeof(Types))) 
            { cb.Items.Add(name); }
        }

        void dh_OnChanged(object o)
        {
            this.Text = o.ToString();
        }

        ComboBox cb;
        DataHolder dh;

        private void TestWin_Load(object sender, EventArgs e)
        {
            cb.DataBindings.Add(new Binding("SelectedIndex", dh, "SelectedTypeInt"));
            //cb.DataBindings.Add(new Binding("SelectedIndex", dh, "SelectedType"));
        }
    }