我有一个xaml页面，但过渡效果不起作用，页面以正常方式显示，没有任何效果。页面代码如下：
<phone:PhoneApplicationPage
x:Class="eenGastos.listadoGastos"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480"
shell:SystemTray.IsVisible="True"
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit">
<toolkit:TransitionService.NavigationInTransition>
<toolkit:NavigationInTransition>
<toolkit:NavigationInTransition.Backward>
<toolkit:TurnstileTransition Mode="BackwardIn"/>
</toolkit:NavigationInTransition.Backward>
<toolkit:NavigationInTransition.Forward>
<toolkit:TurnstileTransition Mode="ForwardIn"/>
</toolkit:NavigationInTransition.Forward>
</toolkit:NavigationInTransition>
</toolkit:TransitionService.NavigationInTransition>
<toolkit:TransitionService.NavigationOutTransition>
<toolkit:NavigationOutTransition>
<toolkit:NavigationOutTransition.Backward>
<toolkit:TurnstileTransition Mode="BackwardOut"/>
</toolkit:NavigationOutTransition.Backward>
<toolkit:NavigationOutTransition.Forward>
<toolkit:TurnstileTransition Mode="ForwardOut"/>
</toolkit:NavigationOutTransition.Forward>
</toolkit:NavigationOutTransition>
</toolkit:TransitionService.NavigationOutTransition>
<!--LayoutRoot es la cuadrícula raíz donde se coloca todo el contenido de la página-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--TitlePanel contiene el nombre de la aplicación y el título de la página-->
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
<TextBlock x:Name="ApplicationTitle" Text="eenGastos" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock x:Name="PageTitle" Text="Lista de gastos" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
</StackPanel>
<ListBox Margin="0,140,0,28" Name="lstGastos" Height="592" Width="450">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="0,0,0,0">
<Image Height="80" Width="80" Margin="2,0,2,0" Name="Image1" VerticalAlignment="Center" Source="{Binding imagenTipoGasto}"/>
<!--"images/gastos/iconosGasto/iconoCOMIDA.png"-->
<StackPanel Width="370" Height="90">
<Grid>
<TextBlock Text="{Binding Concepto}" HorizontalAlignment="Left" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}" Foreground="White"/>
<Grid Width="100" HorizontalAlignment="Right">
<TextBlock Text="{Binding Total}" HorizontalAlignment="left" Style="{StaticResource PhoneTextExtraLargeStyle}" Foreground="Green"/>
<TextBlock Text="{Binding ISOA}" HorizontalAlignment="right" Style="{StaticResource PhoneTextExtraLargeStyle}" Foreground="Green"/>
</Grid>
</Grid>
<Grid>
<TextBlock Text="{Binding Fecha}" Height="43" Width="100" HorizontalAlignment="Left" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}" Foreground="Green"/>
<TextBlock Text="{Binding FormaPago}" Width="200" TextWrapping="Wrap" Margin="70,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}" Foreground="Green"/>
</Grid>
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<ProgressBar
x:Name="pbEnCurso"
IsIndeterminate="true"
Visibility="Collapsed" Grid.ColumnSpan="2" Background="Yellow" Foreground="Yellow" />
</Grid>
代码有什么问题？，如何将过渡效果插入页面？此外，此页面显示此代码：
NavigationService.Navigate(New Uri("/listadoGastos.xaml", UriKind.Relative))
提前谢谢!!