스크롤 있는 Expander 만들기

<Window x:Class="WpfSample.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Width="300" Height="300" >
    <!--스크롤 있는 Expander 만들기-->
    <Expander Width="200" HorizontalContentAlignment="Stretch">
        <Expander.Header>
            <BulletDecorator>
                <BulletDecorator.Bullet>
                    <Image Width="10" Source="images\icon.jpg" />
                </BulletDecorator.Bullet>
            </BulletDecorator>
        </Expander.Header>
        <Expander.Content>
            <ScrollViewer Height="50">
                <TextBlock TextWrapping="Wrap">
                     Lorem ipsum dolor sit amet, consectetur adipisicing elit,
                     sed do eiusmod tempor incididunt ut labore et dolore magna
                     aliqua. Ut enim ad minim veniam, quis nostrud exercitation
                     ullamco laboris nisi ut aliquip ex ea commodo consequat.
                     Duis aute irure dolor in reprehenderit in voluptate velit
                     esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
                     occaecat cupidatat non proident, sunt in culpa qui officia
                     deserunt mollit anim id est laborum.
                </TextBlock>
            </ScrollViewer>
        </Expander.Content>
    </Expander>
</Window>


-C#
void MakeExpander()
{
  //Create containing stack panel and assign to Grid row/col
  StackPanel sp = new StackPanel();
  Grid.SetRow(sp, 0);
  Grid.SetColumn(sp, 1);
  sp.Background = Brushes.LightSalmon;

  //Create column title
  TextBlock colTitle = new TextBlock();
  colTitle.Text = "EXPANDER CREATED FROM CODE";
  colTitle.HorizontalAlignment= HorizontalAlignment.Center;
  colTitle.Margin.Bottom.Equals(20);
  sp.Children.Add(colTitle);

  //Create Expander object
  Expander exp = new Expander();

  //Create Bullet Panel for Expander Header
  BulletDecorator bp = new BulletDecorator();
  Image i = new Image();
  BitmapImage bi= new BitmapImage();
  bi.UriSource = new Uri(@"pack://application:,,/images/icon.jpg");
  i.Source = bi;
  i.Width = 10;
  bp.Bullet = i;
  TextBlock tb = new TextBlock();
  tb.Text = "My Expander";
  tb.Margin = new Thickness(20,0,0,0);    
  bp.Child = tb;
  exp.Header = bp;

  //Create TextBlock with ScrollViewer for Expander Content
  StackPanel spScroll = new StackPanel();
  TextBlock tbc = new TextBlock();
  tbc.Text =
          "Lorem ipsum dolor sit amet, consectetur adipisicing elit," +
          "sed do eiusmod tempor incididunt ut labore et dolore magna" +
          "aliqua. Ut enim ad minim veniam, quis nostrud exercitation" +
          "ullamco laboris nisi ut aliquip ex ea commodo consequat." +
          "Duis aute irure dolor in reprehenderit in voluptate velit" +
          "esse cillum dolore eu fugiat nulla pariatur. Excepteur sint" +
          "occaecat cupidatat non proident, sunt in culpa qui officia" +
          "deserunt mollit anim id est laborum.";
  tbc.TextWrapping = TextWrapping.Wrap;

  spScroll.Children.Add(tbc);
  ScrollViewer scr = new ScrollViewer();
  scr.Content = spScroll;
  scr.Height = 50;
  exp.Content = scr;

  exp.Width=200; 
  exp.HorizontalContentAlignment= HorizontalAlignment.Stretch;
  //Insert Expander into the StackPanel and add it to the
  //Grid
  sp.Children.Add(exp);
  myGrid.Children.Add(sp);
}