如何在WPF中执行此发光效果？

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="WPF发光效果示例" Height="450" Width="800">
    <Grid>
        <Button Content="发光按钮">
            <Button.Effect>
                <DropShadowEffect Color="Yellow" ShadowDepth="0" BlurRadius="20" Opacity="1"/>
            </Button.Effect>
        </Button>
    </Grid>
</Window>