Use GradientStopCollection to group Gradient stops
<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>
<GradientStopCollection x:Key="myGradientStops">
<GradientStop Offset="0.0" Color="Blue" />
<GradientStop Offset="0.4" Color="Black" />
<GradientStop Offset="0.5" Color="White" />
<GradientStop Offset="0.6" Color="Black" />
<GradientStop Offset="0.7" Color="Blue" />
</GradientStopCollection>
</UserControl.Resources>
<Rectangle Width="175" Height="90" Stroke="Black" >
<Rectangle.Fill>
<LinearGradientBrush GradientStops="{StaticResource myGradientStops}">
<LinearGradientBrush.Transform>
<RotateTransform CenterX="87.5" CenterY="45" Angle="45" />
</LinearGradientBrush.Transform>
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
</UserControl>
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