Use PointUsingKeyframes
<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'>
<UserControl.Resources>
<Storyboard x:Name="MovePointDown">
<PointAnimationUsingKeyFrames Storyboard.TargetName="RedPath" Storyboard.TargetProperty="(Path.Data).(PathGeometry.Figures)[0].(PathFigure.Segments)[0].(BezierSegment.Point2)" BeginTime="00:00:00">
<SplinePointKeyFrame KeyTime="00:00:00.5" Value="155,263"/>
</PointAnimationUsingKeyFrames>
<PointAnimationUsingKeyFrames Storyboard.TargetName="RedPath" Storyboard.TargetProperty="(Path.Data).(PathGeometry.Figures)[0].(PathFigure.Segments)[0].(BezierSegment.Point3)" BeginTime="00:00:00">
<SplinePointKeyFrame KeyTime="00:00:00.5" Value="100,263"/>
</PointAnimationUsingKeyFrames>
<PointAnimationUsingKeyFrames Storyboard.TargetName="RedPath" Storyboard.TargetProperty="(Path.Data).(PathGeometry.Figures)[0].(PathFigure.Segments)[1].(BezierSegment.Point1)" BeginTime="00:00:00">
<SplinePointKeyFrame KeyTime="00:00:00.5" Value="44,263"/>
</PointAnimationUsingKeyFrames>
</Storyboard>
</UserControl.Resources>
<Canvas x:Name="LayoutRoot" Background="White" >
<Path Height="263" Width="200" Canvas.Left="295" Canvas.Top="207" Fill="#FFFF0000" Stretch="None" x:Name="RedPath">
<Path.Data>
<PathGeometry>
<PathFigure IsClosed="True" StartPoint="200,100">
<BezierSegment Point1="200,155" Point2="155,200" Point3="100,200"/>
<BezierSegment Point1="44,200" Point2="110,155" Point3="1110,100"/>
<BezierSegment Point1="10,44" Point2="44,0" Point3="100,0"/>
<BezierSegment Point1="155,0" Point2="200,44" Point3="200,100"/>
</PathFigure>
</PathGeometry>
</Path.Data>
</Path>
</Canvas>
</UserControl>
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