xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> Storyboard.TargetProperty="(Canvas.Left)" RepeatBehavior="Forever" AutoReverse="True" /> Storyboard.TargetProperty="(Canvas.Top)"> KeySpline="0.4,0 0.7,0.7" /> KeySpline="0.2,0.2 0.7,0.4" /> KeySpline="0.25,0.25 0.6,1" />