如何在WPF中创建闪烁的矩形笔触

<Window x:Class="BlinkingRectangle.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Blinking Rectangle" Width="200" Height="200">
    <Window.Resources>
        <Storyboard x:Key="BlinkStoryboard" RepeatBehavior="Forever">
            <ColorAnimation Storyboard.TargetName="rectangle" Storyboard.TargetProperty="(Rectangle.Fill).(SolidColorBrush.Color)"
                            From="Red" To="Transparent" Duration="0:0:0.5" AutoReverse="True" />
        </Storyboard>
    </Window.Resources>
    <Grid>
        <Rectangle x:Name="rectangle" Width="100" Height="100" Fill="Red">
            <Rectangle.Style>
                <Style TargetType="Rectangle">
                    <Style.Triggers>
                        <EventTrigger RoutedEvent="Loaded">
                            <BeginStoryboard Storyboard="{StaticResource BlinkStoryboard}" />
                        </EventTrigger>
                    </Style.Triggers>
                </Style>
            </Rectangle.Style>
        </Rectangle>
    </Grid>
</Window>