The Opacity property of this rectangle's SolidColorBrush is animated

    
<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'>
   <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>
                 <DoubleAnimation Storyboard.TargetName="solidColorBrush2"
                  Storyboard.TargetProperty="Opacity"
                  From="1.0" To="0.0" Duration="0:0:10" />
              </Storyboard>
            </BeginStoryboard>
          </EventTrigger>
        </Button.Triggers>
      </Button>
   
   
   </StackPanel>

</UserControl>

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The Opacity property of this rectangle's SolidColorBrush is animated : Color « Graphics « Silverlight

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