Adding 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'>
<TextBlock VerticalAlignment="Stretch"
TextAlignment="Center"
TextWrapping="Wrap"
FontSize="48"
FontWeight="Bold">
<Run Text="Linear Gradient Brush">
<Run.Foreground>
<LinearGradientBrush EndPoint="0.5,1"
StartPoint="0.5,0">
<GradientStop Color="Blue"/>
<GradientStop Color="White"
Offset=".5"/>
<GradientStop Color="Blue"
Offset="1"/>
</LinearGradientBrush>
</Run.Foreground>
</Run>
</TextBlock>
</UserControl>
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