如何在没有图像的WPF中制作具有透明背景和模糊效果的堆叠面板？

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Effects="clr-namespace:System.Windows.Media.Effects;assembly=PresentationCore"
        Title="Transparent and Blur Panel" Height="450" Width="800">
    <Grid Background="Transparent">
        <Rectangle Fill="Transparent" Effect="{DynamicResource {x:Static Effects:BlurEffect.BlurProperty}}">
            <Rectangle.Effect>
                <Effects:BlurEffect Radius="5"/>
            </Rectangle.Effect>
        </Rectangle>
        <StackPanel Background="Transparent">
            <!-- Add your content here -->
        </StackPanel>
    </Grid>
</Window>