<ScrollViewer MaxHeight="400" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Hidden" BorderBrush="Transparent">
<ScrollViewer.Effect>
<DropShadowEffect ShadowDepth="0" Color="Black" Opacity="0.5" Direction="90" BlurRadius="15"/>
</ScrollViewer.Effect>
<StackPanel x:Name="rootStp"/>
</ScrollViewer>

注：當(dāng)ShadowDepth的值為0時(shí)，控件四周都會(huì)有陰影效果。