WPF - FocusVisualStyle我在哪里申请它？

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
   <StackPanel>
       <Button Content="Click me!" FocusVisualStyle="{StaticResource MyFocusVisualStyle}"/>
    </StackPanel>
</Window>

   <Style x:Key="MyFocusVisualStyle" TargetType="Control">
       <Setter Property="Template">
           <Setter.Value>
               <ControlTemplate>
                    <Rectangle Stroke="Red" StrokeThickness="2" Margin="-1"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>