WPF 触发器（根据属性使用动画）

1.是按钮的边框有闪烁的效果，是根据属性来设置的而非一般的事件

 <Style x:Key="PipesButtonStyle" TargetType="Button">
            <Setter Property="Height" Value="25"/>
            <Setter Property="IsHitTestVisible" Value="False"/>
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Microsoft_Windows_Themes:ButtonChrome x:Name="Chrome" BorderBrush="Transparent" Background="{TemplateBinding Background}" RenderPressed="{TemplateBinding IsPressed}" RenderDefaulted="{TemplateBinding IsDefaulted}" SnapsToDevicePixels="true"/>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Effect">
                <Setter.Value>
                    <DropShadowEffect x:Name="effect" BlurRadius="0" Color="Red" Direction="0"
                                      Opacity="0" RenderingBias="Performance" ShadowDepth="0"/>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property="IsHitTestVisible" Value="true">
                    <Trigger.EnterActions>
                        <BeginStoryboard x:Name="enterStory">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetProperty="(FrameworkElement.Effect).(DropShadowEffect.BlurRadius)"
                                                 BeginTime="00:00:00" Duration="00:00:01"
                                                 From="0" To="10" 
                                                 AutoReverse="True" RepeatBehavior="Forever">
                                </DoubleAnimation>
                                <DoubleAnimation Storyboard.TargetProperty="(FrameworkElement.Effect).(DropShadowEffect.Opacity)"
                                                 BeginTime="00:00:00" Duration="00:00:00"
                                                 From="0" To="1" >
                                </DoubleAnimation>
                            </Storyboard>
                        </BeginStoryboard>
                    </Trigger.EnterActions>
                    <Trigger.ExitActions>
                        <StopStoryboard BeginStoryboardName="enterStory">
                        </StopStoryboard>
                    </Trigger.ExitActions>
                </Trigger>
            </Style.Triggers>
        </Style>

2.遇到问题：如果我要感觉Content的值来设置Content的值是不行的，会报错。（错误原因为止，有待商榷）