会员＆＃34;投影＆＃34;不被承认

Question

我试图设置Storyboard.TargetProperty =＆＃34;（UIElement.Projection）＆＃34;财产和我收到一个错误，说明该成员＆＃34;投影＆＃34;无法识别或访问。有谁知道我错过了什么？

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
  Title="MainWindow" Height="350" Width="525">
   <Grid>
       <Image Source="MyImage.bmp" Width="220" Height="220">
           <Image.Triggers>
               <EventTrigger RoutedEvent="Mouse.MouseDown">
                   <BeginStoryboard>
                       <Storyboard>
                            <DoubleAnimation Storyboard.TargetProperty="(UIElement.Projection).(PlaneProjection.RotateX)"  Duration="0:0:2" To="0" />
                       </Storyboard>
                   </BeginStoryboard>
               </EventTrigger>
           </Image.Triggers>
       </Image>    
   </Grid>
</Window>