mas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
&gt;
   &lt;StackPanel x:Name="LayoutRoot" Background="White"&gt;
       &lt;MediaElement MarkerReached="OnMarkerReached"
       HorizontalAlignment="Left"
       Source="/spacetime.wmv"
       Width="300" Height="200" /&gt;
       &lt;ScrollViewer&gt;
           &lt;TextBox Name="captionText" Height="40"
           IsReadOnly="true" AcceptsReturn="true"/&gt;
       &lt;/ScrollViewer&gt;
   &lt;/StackPa