Silverlight opacity animation not working programmatically - silverlight

Question

I'm new at Silverlight and trying samples for things animating the opacity of an object programatically.
I've come up with the following code:
MapShape myTestShape= RadMapInformationLayer.Items[0] as MapShape;
SolidColorBrush brush = new SolidColorBrush();
brush.Color = Colors.Purple;
myTestShape.Fill = brush;
//create a duration object
Duration duration = new Duration(TimeSpan.FromSeconds(5));
//create the storyboard
Storyboard story = new Storyboard();
//create double animation
DoubleAnimation animation = new DoubleAnimation();
//set the duration property
animation.Duration = duration;
//set the from and too values
animation.From = 1.0;
animation.To = 0.0;
//add the duration to the storyboard
story.Duration = duration;
//now set the target of the animation
Storyboard.SetTarget(animation, myTestShape);
//set the target property of this object
Storyboard.SetTargetProperty(animation, new PropertyPath(UIElement.OpacityProperty));
//add the double animations to the story board
story.Children.Add(animation);
if (!LayoutRoot.Resources.Contains("story1"))
LayoutRoot.Resources.Add("story1", story);
story.Begin();
For the property path I've also tried:
1. new PropertyPath("(FrameworkElement.Opacity)")
2. new PropertyPath("(FrameworkElement.Opacity)")
3. new PropertyPath("(Control.Opacity)")
And a few others, I'm having zero luck with this.
Can anyone see where I'm going wrong?
Thanks,
Jacques

Answer 1

I have done databinding to MapShape.FillProperty before.
Try:
//create double animation
ColorAnimation animation = new ColorAnimation();
//set the duration property
animation.Duration = duration;
//set the from and too values
animation.From = Colors.Purple;
animation.To = Colors.Transparent;
//add the duration to the storyboard
story.Duration = duration;
//now set the target of the animation
Storyboard.SetTarget(animation, rect);
//set the target property of this object
Storyboard.SetTargetProperty(animation, new PropertyPath("(MapShape.Fill).Color"));
EDIT:
As for why your code is not working -- Looking through MapShape.SetShapeFillStroke(), it appears that Telerik won't bind the MapShape's Opacity to its inner primitive shape's Opacity unless you provide a fill. Do you have a Fill defined in XAML? If not, try providing one. Otherwise, maybe the code is defined too early in the Shape's lifecycle (in or after ReadCompleted)?
<telerik:InformationLayer x:Name="StateLayer">
<telerik:InformationLayer.Reader>
...
</telerik:InformationLayer.Reader>
<telerik:InformationLayer.ShapeFill>
<telerik:MapShapeFill Fill="{StaticResource CommonBackgroundLightBrush}" Stroke="#5A636B" StrokeThickness="1" />
</telerik:InformationLayer.ShapeFill>