wpf 按钮禁用样式

<Style TargetType="Button" x:Key="NormalButtonStyle">
    <Setter Property="Foreground" Value="White"/>
    <Setter Property="Width" Value="50"/>
    <Setter Property="Height" Value="30"/>
    <Setter Property="Background" Value="#FF0ABEFF"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <Border Background="{TemplateBinding Background}" CornerRadius="4">
                    <Border Background="Transparent" Name="back" CornerRadius="4">
                        <ContentPresenter VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                      HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
                    </Border>
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="Background" Value="#11000000" TargetName="back"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="Button.IsEnabled" Value="False">
            <Setter Property="Background" Value="Gray"/>
        </Trigger>
    </Style.Triggers>
</Style>