<Window x:Class="Main"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="" Height="600" Width="600">
<UniformGrid>
<Ellipse Height="200" Width="200" Fill="Firebrick">
<Ellipse.Triggers>
<EventTrigger RoutedEvent="Ellipse.Loaded">
<BeginStoryboard>
<Storyboard AutoReverse="True" RepeatBehavior="Forever">
<ColorAnimation Storyboard.TargetProperty="Fill.Color" To="White" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Ellipse.Triggers>
</Ellipse>
</UniformGrid>
</Window>
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