SilverlightでのComboBoxの様々な使用について(基本的には上の方法をまとめています)

<Grid x:Name="LayoutRoot" Background="White">
        <ComboBox Height="23" HorizontalAlignment="Left" Margin="26,49,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120" />
        <ComboBox Height="23" HorizontalAlignment="Left" Margin="223,49,0,0" Name="comboBox2" VerticalAlignment="Top" Width="120" SelectionChanged="comboBox2_SelectionChanged" />
        <ComboBox Height="23" HorizontalAlignment="Left" Margin="26,140,0,0" Name="comboBox3" VerticalAlignment="Top" Width="120" />
        <ComboBox Height="23" HorizontalAlignment="Left" Margin="223,140,0,0" Name="comboBox4" VerticalAlignment="Top" Width="120" />
        <ComboBox Height="23" HorizontalAlignment="Left" Margin="26,199,0,0" Name="comboBox5" VerticalAlignment="Top" Width="120" SelectionChanged="comboBox5_SelectionChanged" />
    </Grid>

public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            InitlizePage();
        }

        public void InitlizePage()
        {
            #region comboBox1       

            ComboBoxItem lbi = new ComboBoxItem();
            lbi.SetValue(ComboBoxItem.ContentProperty, "  ");

            this.comboBox1.Items.Add("  ");
            this.comboBox1.Items.Add("  ");
            this.comboBox1.Items.Add("  ");
            this.comboBox1.Items.Add(lbi);

            this.comboBox1.SelectedItem = lbi;
            #endregion

            #region         
            List<Product> _list = new List<Product>();
            _list.Add(new Product() { ID = 11, Name = "  1" });
            _list.Add(new Product() { ID = 22, Name = "  2" });
            _list.Add(new Product() { ID = 33, Name = "  3" });
            _list.Add(new Product() { ID = 44, Name = "  4" });
            _list.Add(new Product() { ID = 55, Name = "  5" });
            _list.Add(new Product() { ID = 66, Name = "  6" });
            #endregion

            #region      
            this.comboBox2.DisplayMemberPath = "Name";
            //this.comboBox2.SelectedValuePath = "ID";//    Value 
            this.comboBox2.UpdateLayout();
            this.comboBox2.ItemsSource = _list;

            //       ，  SelectedItem  ComboBox       web  DropDownList     
            this.comboBox2.SelectedItem = (from p in this.comboBox2.Items
                                           where (p as Product).Name == "  4"
                                           select p).First();
            #endregion
            
            #region 
            this.comboBox5.DisplayMemberPath = "Name";
            this.comboBox5.SelectedValuePath = "ID";//  Value 
            this.comboBox5.UpdateLayout();
            this.comboBox5.ItemsSource = _list;

            int SelectedIndex = -1;

            for(int i =0;i<_list.Count;i++ )
            {
                if (_list[i].ID == 33)
                {
                    SelectedIndex = i;
                    break;
                }
            }
            //  SelectedIndex        
            this.comboBox5.SelectedIndex = SelectedIndex;
            
            #endregion 


            #region      Item
            ComboBoxItem cbiRight = new ComboBoxItem();
            cbiRight.Background = new SolidColorBrush(Colors.Yellow);
            cbiRight.HorizontalContentAlignment = HorizontalAlignment.Right;
            cbiRight.SetValue(ComboBoxItem.ContentProperty, "  ");
           
            ComboBoxItem cbiCenter = new ComboBoxItem(); 
            cbiCenter.Background = new SolidColorBrush(Colors.Cyan);
            cbiCenter.HorizontalContentAlignment = HorizontalAlignment.Center; 
            cbiCenter.SetValue(ComboBoxItem.ContentProperty, "  ");
            ComboBoxItem cbiLeft = new ComboBoxItem();
            cbiLeft.Background = new SolidColorBrush(Colors.LightGray); 
            cbiLeft.HorizontalContentAlignment = HorizontalAlignment.Left;
            cbiLeft.SetValue(ComboBoxItem.ContentProperty, "  ");

            this.comboBox3.Items.Add(cbiRight);
            this.comboBox3.Items.Add(cbiCenter);
            this.comboBox3.Items.Add(cbiLeft);

            #endregion

            Image img = new Image(); 
            img.Source = new BitmapImage(new Uri("img/1.png", UriKind.Relative));

            Label lbl = new Label();
            lbl.Content = "      ";

            StackPanel sp = new StackPanel();
            sp.Orientation = Orientation.Horizontal; 
            sp.Children.Add(img);
            sp.Children.Add(lbl);

            ComboBoxItem multipleCmb = new ComboBoxItem(); 
            multipleCmb.Content = sp;
            this.comboBox4.Items.Add(multipleCmb);  

        }

        private void comboBox2_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Product product = (sender as ComboBox).SelectedItem as Product;
            int selectID = product.ID;
            string selectedName = product.Name;
            //MessageBox.Show(selectID.ToString() + selectedName);

            Product product2 = comboBox2.SelectedValue as Product;
            int selectedID2 = product2.ID;
            string selectedName2 = product2.Name;
            //MessageBox.Show(selectedID2.ToString() + selectedName2);
        }

        //
        private void comboBox5_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            //MessageBox.Show(((ComboBox)sender).SelectedValue.ToString());//  value
            //MessageBox.Show(((Product)((ComboBox)sender).SelectedItem).Name);//  name ？？？？
        }
    }

public class Product
    {
        public int ID { get; set; }

        public string Name { get; set; }
    }