WPF .NET 4.0下实现外发光效果

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1. <Window x:Class="测试外发光.MainWindow"  
2.         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
3.         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
4.         Title="MainWindow" Height="350" Width="525">  
5.     <Grid Background="Black" Height="325" Width="503">          
6.         <Button Content="这是不发光的" Margin="152,59,268,219">  
7.         </Button>  
8.         <Button Content="这是发光的"  Margin="152,123,268,156">  
9.             <Button.Effect>  
10.                 <DropShadowEffect ShadowDepth="0"  
11.                           Color="White"  
12.                           Opacity="1"  
13.                           BlurRadius="20"/>  
14.             </Button.Effect>  
15.         </Button>  
16.     </Grid>  
17. </Window>  

.cs文件里没有代码啦，希望能给大家帮助。