Animation in Silverlight

<navigation:Page x:Class="AnimationSampleCode.Views.StoryboardMethods" 
           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"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="StoryboardMethods Page">
<!--Storyboard Methos-->
<StackPanel Orientation="Vertical" HorizontalAlignment="Left">
    <StackPanel.Resources>
        <Storyboard BeginTime="0:0:0" x:Name="sbEllipse" AutoReverse="True" >
            <DoubleAnimation
                 Storyboard.TargetName="myBrush"
                 Storyboard.TargetProperty="RadiusX"
                 From="0" To="1"
                 Duration="0:0:10" 
                 />
            <DoubleAnimation
                 Storyboard.TargetName="myBrush"
                 Storyboard.TargetProperty="RadiusY"
                 From="0" To="1"
                 Duration="0:0:10"
                  />
        </Storyboard>
    </StackPanel.Resources>

    <TextBlock Text="Storyboard Methods" />
    <Border x:Name="brdTest" BorderBrush="Green" BorderThickness="4" Width="300" Height="400">
        <Ellipse Height="100" Width="100">
            <Ellipse.Fill>
                <RadialGradientBrush x:Name="myBrush"
                              RadiusX="0.5"
                              RadiusY="0.5"
                             GradientOrigin="0.5,0.5">
                    <GradientStop Color="Red" Offset="0.25"/>
                    <GradientStop Color="Blue" Offset="0.50"/>
                    <GradientStop Color="Yellow" Offset="0.75"/>
                    <GradientStop Color="Green" Offset="1.0"/>
                </RadialGradientBrush>
            </Ellipse.Fill>
        </Ellipse>
    </Border>
    <StackPanel Orientation="Horizontal">

        <Button Content="Start" Click="ButtonStart_Click" Width="70" Height="30" HorizontalAlignment="Center" />
    <Button Content="Pause" Click="ButtonPause_Click" Width="70" Height="30" HorizontalAlignment="Center" />

    <Button Content="Resume" Click="ButtonResume_Click" Width="70" Height="30" HorizontalAlignment="Center" />
    <Button Content="Stop" Click="ButtonStop_Click" Width="70" Height="30" HorizontalAlignment="Center" />
</StackPanel>
</StackPanel>

</navigation:Page>