C# 页面导航转换在Windows Phone 8中不起作用？

我创建了一个简单的应用程序，将Silverlight Toolkit添加到我的项目中，并使用以下代码尝试页面导航转换。但它不起作用。奇怪

<toolkit:TransitionService.NavigationInTransition>
    <toolkit:NavigationInTransition>
        <toolkit:NavigationInTransition.Backward>
            <toolkit:SlideTransition Mode="SlideRightFadeIn"/>
        </toolkit:NavigationInTransition.Backward>
        <toolkit:NavigationInTransition.Forward>
            <toolkit:SlideTransition Mode="SlideLeftFadeIn"/>
        </toolkit:NavigationInTransition.Forward>
    </toolkit:NavigationInTransition>
</toolkit:TransitionService.NavigationInTransition>

<toolkit:TransitionService.NavigationOutTransition>
    <toolkit:NavigationOutTransition>
        <toolkit:NavigationOutTransition.Backward>
            <toolkit:SlideTransition Mode="SlideRightFadeOut"/>
        </toolkit:NavigationOutTransition.Backward>
        <toolkit:NavigationOutTransition.Forward>
            <toolkit:SlideTransition Mode="SlideLeftFadeOut"/>
        </toolkit:NavigationOutTransition.Forward>
    </toolkit:NavigationOutTransition>
</toolkit:TransitionService.NavigationOutTransition>

---

我在这里。谁能告诉我那个奇怪的错误是什么

在App.xaml.cs文件中；试着改变

RootFrame = new PhoneApplicationFrame();
TO
RootFrame = new TransitionFrame();

看看这是否有帮助