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The Opacity property of this rectangles SolidColorBrush is animated

<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">    <StackPanel>       <Rectangle          Width="100" Height="50" Stroke="Black" StrokeThickness="1"         Grid.Column="2" Grid.Row="1"         HorizontalAlignment="Center" Margin="10">         <Rectangle.Fill>           <SolidColorBrush x:Name="solidColorBrush2" Color="Blue" />         </Rectangle.Fill>       </Rectangle>       <Button Grid.Column="2" Grid.Row="2"         HorizontalAlignment="Center">         Start Animation         <Button.Triggers>           <EventTrigger RoutedEvent="Button.Click">             <BeginStoryboard>               <Storyboard>                                  <!-- Animates the opacity of a SolidColorBrush from 1 to 0 over 10 seconds. -->                 <DoubleAnimation Storyboard.TargetName="solidColorBrush2"                   Storyboard.TargetProperty="Opacity"                   From="1.0" To="0.0" Duration="0:0:10" />               </Storyboard>             </BeginStoryboard>           </EventTrigger>         </Button.Triggers>       </Button>            </StackPanel> </Window>