WPF属性触发器不发作效果

WPF属性触发器不产生效果
我XAML页面设置这样一个触发器，为什么没有起到效果呢

XML code

<Window x:Class="ProDemo.MainWindow"        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        Title="MainWindow" Height="350" Width="525" Name="FrmMain">    <Window.Resources>        <Style TargetType="{x:Type Button}">            <Style.Triggers>                <Trigger Property="IsMouseOver" Value="True">                    <Setter Property="Background" Value="Black"/>                </Trigger>            </Style.Triggers>        </Style>    </Window.Resources>    <Grid>        <Button Content="Button" Height="43" Margin="12,48,356,218" Name="btn" Width="135" Click="btn_Click" />        <TextBox Height="23" HorizontalAlignment="Left" Margin="12,20,0,0" Name="txt" VerticalAlignment="Top" Width="479" />    </Grid></Window>

鼠标移到按钮上面，应该是要变成橙色才对，但是一点反应都没有，请问是咋回事呀

[解决办法]
<Style TargetType="{x:Type RibbonLib:RibbonButton}">
<Setter Property="Focusable" Value="False"></Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type RibbonLib:RibbonButton}">
<Grid Cursor="Hand">
<!--背景色-->
<Border x:Name="back" Opacity="0.8" CornerRadius="3" BitmapEffect="{DynamicResource {ComponentResourceKey RibbonLib:Skins, RibbonActiveButtonBitmapEffect}}" Background="{DynamicResource {ComponentResourceKey RibbonLib:Skins, RibbonActiveButtonBrush}}">
<!--前景色及边框-->
<Border x:Name="fore" BorderThickness="1" CornerRadius="3" BorderBrush="{DynamicResource {ComponentResourceKey RibbonLib:Skins, RibbonActiveButtonBorderBrush}}">
<Border.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientBrush.GradientStops>
<GradientStopCollection>
<GradientStop Color="#6FFF" Offset="0.5"/>
<GradientStop Color="#1111" Offset="0.51"/>
</GradientStopCollection>
</GradientBrush.GradientStops>
</LinearGradientBrush>
</Border.Background>
<!--按钮内容-->
<StackPanel x:Name="CenterPanel" HorizontalAlignment="Center" VerticalAlignment="Center" Orientation="Horizontal">
<Image x:Name="CenterImage" HorizontalAlignment="Center" VerticalAlignment="Center" Stretch="Fill" Source="{TemplateBinding LargeImage}"/>
<TextBlock x:Name="CenterBlock" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="8,0,0,0" Text="{TemplateBinding Content}" Foreground="{DynamicResource {ComponentResourceKey RibbonLib:Skins, RibbonForgroundBrush}}"/>

</StackPanel>
</Border>
</Border>
</Grid>
<!--触发器-->
<ControlTemplate.Triggers>
<!--鼠标移入移出-->
<Trigger Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation To="6" Duration="0:0:0.2" Storyboard.TargetName="back" Storyboard.TargetProperty="(Border.BitmapEffect).(OuterGlowBitmapEffect.GlowSize)" />
<ColorAnimation To="#AFFF" BeginTime="0:0:0.2" Duration="0:0:0.2" Storyboard.TargetName="fore" Storyboard.TargetProperty="(Border.Background).(LinearGradientBrush.GradientStops)[0].(GradientStop.Color)" />
<ColorAnimation To="#3FFF" BeginTime="0:0:0.2" Duration="0:0:0.2" Storyboard.TargetName="fore" Storyboard.TargetProperty="(Border.Background).(LinearGradientBrush.GradientStops)[1].(GradientStop.Color)" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
<Trigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Duration="0:0:0.2" Storyboard.TargetName="back" Storyboard.TargetProperty="(Border.BitmapEffect).(OuterGlowBitmapEffect.GlowSize)" />
<ColorAnimation Duration="0:0:0.2" Storyboard.TargetName="fore" Storyboard.TargetProperty="(Border.Background).(LinearGradientBrush.GradientStops)[0].(GradientStop.Color)" />
<ColorAnimation Duration="0:0:0.2" Storyboard.TargetName="fore" Storyboard.TargetProperty="(Border.Background).(LinearGradientBrush.GradientStops)[1].(GradientStop.Color)" />
</Storyboard>
</BeginStoryboard>
</Trigger.ExitActions>
</Trigger>
</ControlTemplate.Triggers>

</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
[解决办法]
在WPF中，触发器仅有效于样式和模板中，并且需要EventTriggers支持。
如果需要将触发器用于样式和模板外，可以将触发器套在一下代码：

XML code

<Control>    <Control.Template>        <ControlTemplate>            <!-- 触发器代码 -->        </ControlTemplate>    </Control.Template></Control> 

 

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