silverlight 动画有关问题

silverlight 动画问题
用silverlight3.0做WINCE应用程序
在blend里做好了动画，但是程序控制播放动画时失败
调用storyboard.Begin();后返回值为：XR_E_STORYBOARD_BEGIN_INVALID_PROPERTY：
Silverlight for Windows Embedded cannot begin this storyboard. The property to be animated is invalid.

VC调用代码：

C/C++ code

   IXRStoryboardPtr sbShowWnd;   if (FAILED(root->FindName(TEXT("sbShowWnd"), &sbShowWnd)))    return -1;   sbShowWnd->Begin();  //执行到这步了，但是返回值是XR_E_STORYBOARD_BEGIN_INVALID_PROPERTY

XML code

<UserControl    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    x:Class="SESample.Page"    Width="1024" Height="600" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d">    <UserControl.Resources>        <Storyboard x:Name="sbShowWnd" AutoReverse="False">            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="imgBg2" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)">                <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0.233"/>                <SplineDoubleKeyFrame KeyTime="00:00:00.1000000" Value="0.325"/>                <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="0.475"/>                <SplineDoubleKeyFrame KeyTime="00:00:00.3000000" Value="0.686"/>                <SplineDoubleKeyFrame KeyTime="00:00:00.5000000" Value="1.001"/>            </DoubleAnimationUsingKeyFrames>            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="imgBg2" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleY)">                <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0.233"/>                <SplineDoubleKeyFrame KeyTime="00:00:00.1000000" Value="0.37"/>                <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="0.527"/>                <SplineDoubleKeyFrame KeyTime="00:00:00.3000000" Value="0.67"/>                <SplineDoubleKeyFrame KeyTime="00:00:00.5000000" Value="0.978"/>            </DoubleAnimationUsingKeyFrames>                </Storyboard>    </UserControl.Resources>    <Grid x:Name="LayoutRoot" Background="White">        <Canvas x:Name="cvsMain">            <Image Height="600" Width="1024" Source="bg.png" x:Name="imgBg" Canvas.Left="0" Canvas.Top="0" Stretch="UniformToFill"/>            <Image Height="80" Width="246" Canvas.Left="397.365" Canvas.Top="408.5" Source="closeNormal.png" x:Name="imgClose"/>            <TextBlock Height="69.757" Width="429.168" Canvas.Left="285.496" Canvas.Top="88.757" TextWrapping="Wrap" x:Name="tbTextBlock"  FontFamily="Verdana" FontSize="48"><Run Text="Silverlight Demo!" FontFamily="Verdana" FontSize="48" Foreground="#FF010907"/></TextBlock>        </Canvas>        <Canvas x:Name="cvsShutDown" Visibility="Visible">            <Image Height="600" Width="1024" Source="ShutDownBg.png" x:Name="imgBg2" Stretch="UniformToFill" RenderTransformOrigin="0.5,0.5">                <Image.RenderTransform>                    <TransformGroup>                        <ScaleTransform/>                        <SkewTransform/>                        <RotateTransform/>                        <TranslateTransform/>                    </TransformGroup>                </Image.RenderTransform>            </Image>            <Image Height="112" Width="347" Canvas.Left="513.019" Canvas.Top="394.378" x:Name="imgShutDown" Source="imgTrans.png"/>            <Image Height="112" Width="345.5" Source="imgTrans.png" x:Name="imgCancel" Canvas.Left="163.519" Canvas.Top="394.378"/>        </Canvas>    </Grid></UserControl>