Silverlight Xaml: Location indicator with animated ellipses.

Question

I have a map. When i query it takes me to that point or location. I would like a location indicator that shows at that location ellipses in form of a wave motion but with thier strokes/bounderies showing. Like in this image:http://i50.tinypic.com/2guji1k.jpg I picked up this xaml from somewhere but it animates using the gradientbrush.

Any help will be appreciated.

<UserControl
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 x:Class="AnimatedCircles.MainPage"
 Width="640" Height="480"> 
<Canvas>
  <Canvas.Triggers>
    <EventTrigger RoutedEvent="Canvas.Loaded">
      <EventTrigger.Actions>
        <BeginStoryboard>
          <Storyboard>            
            <DoubleAnimation Storyboard.TargetName="elOffset1" Storyboard.TargetProperty="Offset" 
                From="0.5" To="0.0" RepeatBehavior="Forever" AutoReverse="True"/>
            <DoubleAnimation Storyboard.TargetName="elOffset2" Storyboard.TargetProperty="Offset" 
                From="1.0" To="0.5" RepeatBehavior="Forever" AutoReverse="True"/>
          </Storyboard>
        </BeginStoryboard>

      </EventTrigger.Actions>
    </EventTrigger>
  </Canvas.Triggers>  
  <Ellipse Canvas.Left="15" Canvas.Top="235" Width="150" Height="150">
    <Ellipse.Fill>
      <RadialGradientBrush>
        <GradientStop x:Name="elOffset1" Color="Red" Offset="0.0"/>
        <GradientStop x:Name="elOffset2" Color="Yellow" Offset="0.50"/>
        <GradientStop x:Name="elOffset3" Color="White" Offset="1.0"/>
      </RadialGradientBrush>
    </Ellipse.Fill>
  </Ellipse>

</Canvas>
</UserControl>