Combobox background not being applied in windows 8

Question

I am a little confused with wpf themes. I would like to have the wpf screens look the same on Vista, Windows 7 and Windows 8. So I have styled the components accordingly and

Answer 1

I did a bit of a hack on the built-in template. Not the cleanest solution, but removes the headache of having to roll my own template. The code behind basically binds the built-in template border's properties with the combo box's properties.

    private void ComboBox_Loaded(object sender, RoutedEventArgs e)
    {
        var comboBox = sender as ComboBox;
        var toggleButton = comboBox.Template?.FindName("toggleButton", comboBox) as ToggleButton;
        var border = toggleButton?.Template.FindName("templateRoot", toggleButton) as Border;
        if (border != null)
        {
            Binding b = new Binding("Background");
            b.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(ComboBox), 1);
            BindingOperations.SetBinding(border, Control.BackgroundProperty, b);

            b = new Binding("BorderBrush");
            b.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(ComboBox), 1);
            BindingOperations.SetBinding(border, Control.BorderBrushProperty, b);
        }
    }