Animates the text block's width

   
     
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="Microsoft.Samples.Graphics.RectangleExample"
    WindowTitle="Example">
  <Canvas>
      <TextBlock
        Name="MyWipedText"
        Margin="20" 
        Width="480" Height="100" FontSize="48" FontWeight="Bold" Foreground="Maroon">
        This is wiped text

        <TextBlock.Triggers>
          <EventTrigger RoutedEvent="TextBlock.Loaded">
            <BeginStoryboard>
              <Storyboard>
                <DoubleAnimation
                  Storyboard.TargetName="MyWipedText" 
                  Storyboard.TargetProperty="(TextBlock.Width)"
                  To="0.0" Duration="0:0:10" 
                  AutoReverse="True" RepeatBehavior="Forever" />
              </Storyboard>
            </BeginStoryboard>
          </EventTrigger>
        </TextBlock.Triggers>
      </TextBlock>

  </Canvas>
</Page>