Combobox Binding in a Datatemplate from CodeBehind

This question has probably been asked several times.  However all the posts I land on does not solve my problem.  I have a DataModel that has an observable collection inside an observable collection.  The visual tree should look something like ItemsControl->VirtualizingStack->Combobox.  The following is simple example and "theoretically" items should appear in dropdown but it doesn't.  Where am I going wrong.

    Public MainWindow()
    {
        InitializeComponent();

        ObservableCollection<Tester> Tester1 = new ObservableCollection<Tester>();
        Tester1.Add(new Tester("Sunny", "Jenkins"));
        Tester1.Add(new Tester("Pieter", "Pan"));

        ObservableCollection<Tester> Tester2 = new ObservableCollection<Tester>();
        Tester2.Add(new Tester("Jack", "Sanders"));
        Tester2.Add(new Tester("Bill", "Trump"));

        ObservableCollection<TheT> myDataV = new ObservableCollection<TheT>();
        myDataV.Add(new TheT(Tester1));
        myDataV.Add(new TheT(Tester2));
      
        IControl.ItemsSource = myDataV;
        IControl.ItemTemplate = TestingDT;
    }

    <ItemsControl x:Name="IControl" Margin="53,375,81,63">
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <VirtualizingStackPanel Orientation="Horizontal"/>
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
    </ItemsControl>

    //the Datatemplate
    private DataTemplate TestingDT
    {
        get
        {
                DataTemplate DFT = new DataTemplate();
                DFT.DataType = typeof(TheT);

                FrameworkElementFactory Item = new FrameworkElementFactory(typeof(ComboBox));

                Binding B = new Binding("TesterObject")
                {
                    Source = this
                };
               
                Item.SetBinding(ComboBox.ItemsSourceProperty, B);
                //Item.SetValue(ComboBox.DisplayMemberPathProperty, "Name");

                DFT.VisualTree = Item;
                return DFT;
            }
        }

    //And the DATA Model
    class Tester
        {
            public Tester(string name, string surname)
            {
                Name = name;
                Surname = surname;
            }

            public string Name { get; set; }
            public string Surname { get; set; }
            public override string ToString()
            {
                return Name + " " + Surname;
            }
        }

        class TheT
        {
            ObservableCollection<Tester> TesterObject;

            public TheT(ObservableCollection<Tester> testerObject)
            {
                TesterObject = testerObject;
            }

            public string myDisplayName { get { return "test"; } }

            public void Add(Collection<Tester> col)
            {
                TesterObject.Clear();
                foreach (Tester t in col)
                { TesterObject.Add(t); }
            }
        }