在Expression Blend中無法識別成員「TextTrimming」？

所以我使用的Silverlight 4.0我有以下代碼，但它給了我以下錯誤：「成員」TextTrimming「無法識別或無法訪問」，但它工作正常，當我在Visual Studio 2010中運行。在Expression Blend中無法識別成員「TextTrimming」？

<TextBlock Margin="0,30,28.789,50.455" TextWrapping="Wrap" TextTrimming="WordEllipsis" HorizontalAlignment="Right" Width="117" RenderTransformOrigin="0.5,0.5" UseLayoutRounding="False" d:LayoutRounding="Auto" Text="This is some text in a sticky note for the sake of making sure that the text will fit and that the user can see all the necessary details that are going to be available and stuff" LineHeight="-1" FontWeight="Normal"> 
<TextBlock.RenderTransform> 
    <TransformGroup> 
     <ScaleTransform/> 
     <SkewTransform AngleX="8"/> 
     <RotateTransform/> 
     <TranslateTransform/> 
    </TransformGroup> 
</TextBlock.RenderTransform>

來源

2010-05-21 emalamisura