ListBox Selected Index, Item, Value

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<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WpfApplication1" Height="399" Width="320" WindowStartupLocation="CenterScreen">
    <StackPanel xmlns:CorLib = "clr-namespace:System;assembly=mscorlib">
    <ListBox Name = "dataList"/>
    <ListBox Name = "lstColors">
      <StackPanel Orientation ="Horizontal" Tag ="Yellow">
        <Ellipse Fill ="Yellow" Height ="50" Width ="50"/>
        <Label FontSize ="20" HorizontalAlignment="Center"
          VerticalAlignment="Center">Yellow</Label>
      </StackPanel>
      <StackPanel Orientation ="Horizontal" Tag ="Blue">
        <Ellipse Fill ="Blue" Height ="50" Width ="50"/>
        <Label FontSize ="20" HorizontalAlignment="Center"
          VerticalAlignment="Center">Blue</Label>
      </StackPanel>
      <StackPanel Orientation ="Horizontal" Tag ="Green">
        <Ellipse Fill ="Green" Height ="50" Width ="50"/>
        <Label FontSize ="20" HorizontalAlignment="Center"
          VerticalAlignment="Center">Green</Label>
      </StackPanel>
    </ListBox>
    <Button Name ="btnGetGameSystem" Click ="btnGetGameSystem_Click">
      Video
    </Button>
    <Button Name ="btnGetColor" Click ="btnGetColor_Click">
      Get Color
    </Button>
  </StackPanel>
</Window>
//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;


namespace WpfApplication1
{
  public partial class MainWindow : System.Windows.Window
  {

    public MainWindow()
    {
      InitializeComponent();
      dataList.Items.Add("A");
      dataList.Items.Add("B");
      dataList.Items.Add("C");
      dataList.Items.Add("D");
      dataList.Items.Add("E");
    } 
    protected void btnGetGameSystem_Click(object sender, RoutedEventArgs args)
    {
      Console.WriteLine(dataList.SelectedIndex);
      Console.WriteLine(dataList.SelectedItem);
      Console.WriteLine(dataList.SelectedValue);
    }

    protected void btnGetColor_Click(object sender, RoutedEventArgs args)
    {
      Console.WriteLine((lstColors.Items[lstColors.SelectedIndex] as StackPanel).Tag);
    }
  }
}