silverlight按钮换背景图
请问silverlight下button换背景图
<Button Content="B" Height="26" HorizontalAlignment="Left" Name="button3" VerticalAlignment="Stretch" Width="75" Margin="10,165,0,137" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FlowDirection="LeftToRight">
<Button.BorderBrush>
<ImageBrush ImageSource="/SilverlightApplication1;component/Images/213.png" Stretch="UniformToFill" />
</Button.BorderBrush>
<Button.Background>
<ImageBrush ImageSource="/SilverlightApplication1;component/Images/213.png" Stretch="UniformToFill" />
</Button.Background>
</Button>
这样能隐约看到背景图在按钮的后面,请问应该怎么实现
谢谢大家