Animate EndPoint
<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<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>
</UserControl>
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