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任何人都可以請幫助我還是有什麼我錯過了?該visualSTATE是不會觸發Silverlight 4.0 VisualStateManager

xmlns:swi="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" xmlns:esi="clr-namespace:Expression.Samples.Interactivity;assembly=Expression.Samples.Interactivity" xmlns:mei="clr-namespace:Microsoft.Expression.Interactivity.Core;assembly=Microsoft.Expression.Interactions"

<my:DataGridTemplateColumn IsReadOnly="True"> 
       <my:DataGridTemplateColumn.CellTemplate> 
        <DataTemplate> 
         <StackPanel Orientation="Horizontal"> 
         <VisualStateManager.VisualStateGroups> 
           <VisualStateGroup x:Name="vsgUrgency"> 
            <VisualState x:Name="UrgencySerious"> 
             <Storyboard> 
              <ColorAnimation Storyboard.TargetName="orbUrgency" 
             Storyboard.TargetProperty="Fill" To="Red"/> 
             </Storyboard> 
            </VisualState> 
            <VisualState x:Name="UrgencyNormal"> 
             <Storyboard> 
              <ColorAnimation Storyboard.TargetName="orbUrgency" 
             Storyboard.TargetProperty="Fill" To="Green"/> 
             </Storyboard> 
            </VisualState> 
           </VisualStateGroup> 
          </VisualStateManager.VisualStateGroups>  
          <swi:Interaction.Triggers> 
           <esi:DataTrigger Binding="{Binding Urgency}" Value="Serious"> 
            <mei:GoToStateAction StateName="UrgencySerious"/> 
           </esi:DataTrigger> 
           <esi:DataTrigger Binding="{Binding Urgency}" Value="Normal"> 
            <mei:GoToStateAction StateName="UrgencyNormal"/> 
           </esi:DataTrigger> 
          </swi:Interaction.Triggers> 
          <TextBlock Text="{Binding Urgency}"/> 
          <Path x:Name="orbUrgency" Width="14.6566" Height="14.5449" Stretch="Fill" StrokeThickness="1" 
          StrokeLineJoin="Round" Fill="#FFE50A0A" 
          Data="F1 M 9.3269,3.61737C 13.3742,3.61737 16.6552,6.87332 16.6552,10.8898C 16.6552,14.9063 13.3742,18.1623 9.3269,18.1623C 5.2796,18.1623 1.99862,14.9063 1.99862,10.8898C 1.99862,6.87332 5.27956,3.61737 9.3269,3.61737 Z "> 
          </Path> 
         </StackPanel> 
        </DataTemplate> 
       </my:DataGridTemplateColumn.CellTemplate> 
      </my:DataGridTemplateColumn> 

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