silverlight combobox image label

在combobox 同时显示图片，文字，如图：

引用：using System.Windows.Media.Imaging;

功能函数如下：

  /// <summary>
        /// combobox 下拉同時顯示 圖片文字
        /// </summary>
        /// <param name="_cmbImg"></param>
        /// <param name="ImgPath"></param>
        /// <param name="Title"></param>
        /// <returns></returns>
        public void  cmbImg( ComboBox _cmbImg,  string ImgPath, string Title)
        {
            BitmapImage bitmap = new BitmapImage();
            bitmap.UriSource = new Uri(ImgPath, UriKind.Relative);

            Image img = new Image()
            {
                Width = 20,
                Height = 15,
                Margin = new Thickness(0),
                Source = bitmap,
                // Tag = "Images/ColorCard/" + str
            };

            Label lbl = new Label()
            {
                Content =Title ,
                FontFamily =  new FontFamily("Arial"),
                FontSize =15

            };
    
            StackPanel stackPanels = new StackPanel();
            stackPanels.Orientation = Orientation.Horizontal;//水平 Orientation.Horizontal,垂直 Orientation.Vertical
            stackPanels.Children.Add(img);
            stackPanels.Children.Add(lbl);

            ComboBoxItem multipleCmb = new ComboBoxItem();
            multipleCmb.Content = stackPanels;

            _cmbImg.Items.Add(multipleCmb);

        }

此功能函数有些不足之处：当在选择着 如 1516 粉红色，如何取得 1516这个值？请大家帮助想想，有什么办法可以解决？