WPF动画未启动

所有我都有以下DataGrid

<DataGrid x:Name="resourceDataGrid" 
          HorizontalAlignment="Stretch" 
          VerticalAlignment="Stretch" 
          AutoGenerateColumns="false" 
          GridLinesVisibility="None"
          RowHeaderWidth="0" 
          CanUserAddRows="True" 
          CanUserDeleteRows="True" 
          ItemsSource="{Binding Path=Resources, 
                                Mode=TwoWay,
                                UpdateSourceTrigger=PropertyChanged, 
                                IsAsync=True}">
    <DataGrid.Columns>
        <DataGridTemplateColumn CellTemplate="{StaticResource readOnlyCellUpdatedStyle}"  IsReadOnly="True"/>
        <!--<DataGridTextColumn Header="KeyIndex" Binding="{Binding KeyIndex}" IsReadOnly="True"/>--> <- What I did have...
        <DataGridTextColumn Header="FileName" Binding="{Binding FileName}" IsReadOnly="True"/>
        <DataGridTextColumn Header="ResourceName" Binding="{Binding ResourceName}" IsReadOnly="False"/>
        <controls:CollectionTextColumn Collection="ResourceStringList" Visibility="Collapsed"/>
    </DataGrid.Columns>
</DataGrid>

当数据集中的一行被删除时，我想对KeyIndex列重新编号。当这种重新编号发生时，我想优雅地闪烁更新的单元格，让用户知道这些值已经更新。

我已经创建了以下DataTemplate

<DataTemplate x:Key="readOnlyCellUpdatedStyle">
    <TextBlock Text="{Binding KeyIndex, NotifyOnSourceUpdated=True, Mode=TwoWay}">
        <TextBlock.Style>
            <Style TargetType="TextBlock">
                <Style.Triggers>
                    <EventTrigger RoutedEvent="Binding.SourceUpdated">
                        <BeginStoryboard>
                            <Storyboard>
                                <ColorAnimation Storyboard.TargetProperty="Background.Color" 
                                                Duration="0:0:0.3"
                                                From="White" 
                                                To="Red" 
                                                RepeatBehavior="3x" 
                                                AutoReverse="True"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </EventTrigger>
                </Style.Triggers>
            </Style>
        </TextBlock.Style>
    </TextBlock>
</DataTemplate>

绑定仍然适用于KeyIndex，但当我更新ViewModel中的KayIndex值时，现在动画发生了，值只是发生了变化为什么KeyIndex更新时动画未启动

谢谢你抽出时间。