Listing 3: The Thumb Style from TextTransformer.xaml

<Style x:Key="thumbStyle" TargetType="Thumb">
  <Setter Property="HorizontalAlignment" Value="Left" />
  <Setter Property="VerticalAlignment" Value="Top" />
  <Setter Property="Width" Value="{StaticResource ThumbSize}" />
  <Setter Property="Height" Value="{StaticResource ThumbSize}" />
  <Setter Property="RenderTransform">
    <Setter.Value>
      <TranslateTransform 
        X="{StaticResource HalfThumbOffset}"
        Y="{StaticResource HalfThumbOffset}" />
    </Setter.Value>
  </Setter>
</Style>