button 鼠标移上下、不可用 变化图片

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <!--   定义按钮样式-->
    <Style TargetType="Button">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="OverridesDefaultStyle" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Grid  x:Name="buttonbackground">
                        <Grid.Background>
                            <ImageBrush ImageSource="/WpfApplication1;component/image/button.png"></ImageBrush>
                        </Grid.Background>
                        <ContentPresenter Margin="0,0,0,0" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="buttonbackground" Property= "Background">
                                <Setter.Value>
                                    <ImageBrush ImageSource="/WpfApplication1;component/image/button2.png"></ImageBrush>
                                </Setter.Value>
                            </Setter>
                        </Trigger>

                        <Trigger Property="IsPressed" Value="True">
                            <Setter TargetName="buttonbackground" Property= "Background">
                                <Setter.Value>
                                    <ImageBrush ImageSource="/WpfApplication1;component/image/button3.png"></ImageBrush>
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter TargetName="buttonbackground" Property= "Background">
                                <Setter.Value>
                                    <ImageBrush ImageSource="/WpfApplication1;component/image/button4.png"></ImageBrush>
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

  
</ResourceDictionary>