ScrollViewer and Big Ellipse

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  HorizontalAlignment="Center" VerticalAlignment="Center">
<ScrollViewer HorizontalScrollBarVisibility="Auto">
  <Ellipse Fill="Red" Height="800" Width="1200" />
</ScrollViewer>
</Page>

