XAML That Implements a RadialGradientBrush to a Rectangle Control
<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'>
<Rectangle Height="120" Width="200">
<Rectangle.Fill>
<RadialGradientBrush RadiusX="0.8"
RadiusY="0.4"
GradientOrigin="0.5,0.75">
<GradientStop Color="Blue"/>
<GradientStop Color="White" Offset="0.5"/>
<GradientStop Color="Blue" Offset="1"/>
</RadialGradientBrush>
</Rectangle.Fill>
</Rectangle>
</UserControl>
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