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OpacityMask example

<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">     <Canvas.OpacityMask>         <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">             <LinearGradientBrush.GradientStops>                 <GradientStop Color="Transparent" Offset="0"/>                 <GradientStop Color="White" Offset="1"/>             </LinearGradientBrush.GradientStops>         </LinearGradientBrush>     </Canvas.OpacityMask>     <Ellipse         Fill="LightGray"         Stroke="Black"         StrokeThickness="20"         Width="200"         Height="200"     />     <Rectangle         Fill="Gray"         Stroke="Black"         StrokeThickness="20"         Canvas.Left="100"         Canvas.Top="100"         Width="200"         Height="200"     /> </Canvas> </UserControl>