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Rainbow color Animation by GradientStops[index] offset

<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">     <Path Canvas.Left="150" Canvas.Top="150" StrokeThickness="25">         <Path.Data>             <PathGeometry>                 <PathGeometry.Figures>                     <PathFigure StartPoint="0 -100">                         <PolyBezierSegment                              Points=" 0 -100,-100 0,-100 0,100 -50,55 -100,0 -100" />                     </PathFigure>                 </PathGeometry.Figures>             </PathGeometry>         </Path.Data>         <Path.Stroke>             <LinearGradientBrush x:Name="brush">                 <LinearGradientBrush.GradientStops>                     <GradientStop Color="Red" />                     <GradientStop Color="Orange" />                     <GradientStop Color="Yellow" />                     <GradientStop Color="Green" />                     <GradientStop Color="Blue" />                     <GradientStop Color="Indigo" />                     <GradientStop Color="Violet" />                 </LinearGradientBrush.GradientStops>             </LinearGradientBrush>         </Path.Stroke>         <Path.Triggers>             <EventTrigger RoutedEvent="Path.Loaded">                 <BeginStoryboard>                     <Storyboard TargetName="brush" SpeedRatio="3">                         <DoubleAnimation                             Storyboard.TargetProperty="GradientStops[0].Offset"                             From="0" To="1" Duration="0:0:7"                             RepeatBehavior="Forever" />                         <DoubleAnimation                             Storyboard.TargetProperty="GradientStops[1].Offset"                             From="0" To="1"  Duration="0:0:7"                              BeginTime="0:0:1" RepeatBehavior="Forever" />                         <DoubleAnimation                             Storyboard.TargetProperty="GradientStops[2].Offset"                             From="0" To="1" Duration="0:0:7"                             BeginTime="0:0:2" RepeatBehavior="Forever" />                         <DoubleAnimation                             Storyboard.TargetProperty="GradientStops[3].Offset"                             From="0" To="1" Duration="0:0:7"                             BeginTime="0:0:3" RepeatBehavior="Forever" />                         <DoubleAnimation                             Storyboard.TargetProperty="GradientStops[4].Offset"                             From="0" To="1" Duration="0:0:7"                             BeginTime="0:0:4" RepeatBehavior="Forever" />                         <DoubleAnimation                             Storyboard.TargetProperty="GradientStops[5].Offset"                             From="0" To="1" Duration="0:0:7"                             BeginTime="0:0:5" RepeatBehavior="Forever" />                         <DoubleAnimation                             Storyboard.TargetProperty="GradientStops[6].Offset"                             From="0" To="1" Duration="0:0:7"                             BeginTime="0:0:6" RepeatBehavior="Forever" />                     </Storyboard>                 </BeginStoryboard>             </EventTrigger>         </Path.Triggers>     </Path> </Canvas>