Brush animation
<UserControl x:Class='SilverlightApplication3.MainPage'
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'
d:DesignWidth='640'
d:DesignHeight='480'>
<UserControl.Resources>
<Storyboard x:Name="ellipseStoryboard">
<PointAnimation Storyboard.TargetName="ellipseBrush"
Storyboard.TargetProperty="GradientOrigin"
From="0.7,0.3" To="0.3,0.7" Duration="0:0:10" AutoReverse="True"
RepeatBehavior="Forever">
</PointAnimation>
<ColorAnimation Storyboard.TargetName="ellipseBrushStop"
Storyboard.TargetProperty="Color"
To="Yellow" Duration="0:0:10" AutoReverse="True"
RepeatBehavior="Forever">
</ColorAnimation>
</Storyboard>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White">
<Ellipse x:Name="ellipse" Margin="5" Grid.Row="1" Stretch="Uniform">
<Ellipse.Fill>
<RadialGradientBrush x:Name="ellipseBrush"
RadiusX="1" RadiusY="1" GradientOrigin="0.7,0.3">
<GradientStop x:Name="ellipseBrushStop" Color="White" Offset="0"></GradientStop>
<GradientStop Color="Blue" Offset="1"></GradientStop>
</RadialGradientBrush>
</Ellipse.Fill>
</Ellipse>
</Grid>
</UserControl>
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