Animate EndPoint

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<Window x:Class="Main"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="" Height="300" Width="300">
  <Grid>
    <Path Stroke="Black" StrokeThickness="1">
      <Path.Data>
        <GeometryGroup>
          <LineGeometry x:Name="line1" StartPoint="20,20" EndPoint="264,20" />
        </GeometryGroup>
      </Path.Data>
      <Path.Triggers>
        <EventTrigger RoutedEvent="Path.Loaded">
          <BeginStoryboard>
            <Storyboard AutoReverse="True" RepeatBehavior="Forever">
              <PointAnimation To="40,20" 
                              Storyboard.TargetName="line1" 
                              Storyboard.TargetProperty="EndPoint" />
            </Storyboard>
          </BeginStoryboard>
        </EventTrigger>
      </Path.Triggers>
    </Path>
  </Grid>
</Window>