A basic LinearGradientBrush rendered horizontally
<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'>
<Grid x:Name="LayoutRoot" Background="White">
<Ellipse Stroke="Black" StrokeThickness="3" Width="64" Height="64" Canvas.Left="8" Canvas.Top="8">
<Ellipse.Fill>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
<GradientStop Color="Navy" Offset="0" />
<GradientStop Color="White" Offset="1" />
</LinearGradientBrush>
</Ellipse.Fill>
</Ellipse>
</Grid>
</UserControl>
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