WPF:如何使用默认情况下使用系统按钮背景的自定义按钮模板？

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

   <Setter Property="Template">
       <Setter.Value>
           <ControlTemplate TargetType="{x:Type Button}">
               <Border Background="{TemplateBinding Background}">
                   <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>