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LinearGradientBrush Opacity from 1 to 0

<Window x:Class="Workspace.DockExample"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="Workspace" Width="640" Height="480">     <Window.Resources>         <GradientStopCollection x:Key="myGradientStops">       <GradientStop Color="Blue" Offset="0.0" />       <GradientStop Color="Black" Offset="0.5" />       <GradientStop Color="Transparent" Offset="1.0" />     </GradientStopCollection>     </Window.Resources>     <StackPanel>     <Rectangle Width="100" Height="50" Stroke="Black" StrokeThickness="1">       <Rectangle.Fill>         <LinearGradientBrush GradientStops="{StaticResource myGradientStops}" Opacity="1" />       </Rectangle.Fill>     </Rectangle>     <Rectangle Width="100" Height="50" Stroke="Black" StrokeThickness="1">       <Rectangle.Fill>         <LinearGradientBrush GradientStops="{StaticResource myGradientStops}" Opacity="0.75" />       </Rectangle.Fill>     </Rectangle>     <Rectangle Width="100" Height="50" Stroke="Black" StrokeThickness="1">       <Rectangle.Fill>         <LinearGradientBrush GradientStops="{StaticResource myGradientStops}" Opacity="0.5" />       </Rectangle.Fill>     </Rectangle>     <Rectangle Width="100" Height="50" Stroke="Black" StrokeThickness="1">       <Rectangle.Fill>         <LinearGradientBrush GradientStops="{StaticResource myGradientStops}" Opacity="0.25" />       </Rectangle.Fill>     </Rectangle>     <Rectangle Width="100" Height="50" Stroke="Black" StrokeThickness="1">       <Rectangle.Fill>         <LinearGradientBrush GradientStops="{StaticResource myGradientStops}" Opacity="0" />       </Rectangle.Fill>     </Rectangle>     </StackPanel> </Window>