Consider the following use of a LinearGradientBrush
<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'>
<Canvas xmlns="http://schemas.microsoft.com/client/2007">
<Ellipse
Width="450"
Height="450"
>
<Ellipse.Fill>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="White" Offset="0"/>
<GradientStop Color="Black" Offset="1"/>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Ellipse.Fill>
</Ellipse>
</Canvas>
</UserControl>
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