Windows Phone中的C#定向

我是Windows Phone的业余爱好者，如何在横向模式和纵向模式下自动更改方向大小？

在C#WinForms中，我可以使用Dock或Anchor，它完全可以工作，但在windows phone中我不能。

这是我的XAML代码，可以帮我吗？

<phone:PhoneApplicationPage
    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"
    xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
    xmlns:local="clr-namespace:testApp"
    x:Class="testApp.DLPage"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="PortraitOrLandscape" Orientation="Portrait"
    mc:Ignorable="d"
    Background="#FF262626"
    shell:SystemTray.IsVisible="False" >
    <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>
    <ScrollViewer HorizontalAlignment="Left" VerticalAlignment="Top">
        <Grid x:Name="gridOrg" HorizontalAlignment="Left"  VerticalAlignment="Top" Width="480" Height="800" >
            <Grid x:Name="gridPanel" HorizontalAlignment="Left" Height="780" Margin="10,10,0,0" VerticalAlignment="Top" Width="460" Background="#FF3E3E3E">
                <Ellipse x:Name="elp" HorizontalAlignment="Left" Height="455" Margin="4,4,0,0" Stroke="Black" VerticalAlignment="Top" Width="453" Tap="elp_Tap"/>
                <TextBlock x:Name="txtTitle" HorizontalAlignment="Left" Margin="6,478,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="162" Width="447"/>
                <TextBlock x:Name="cntDL" HorizontalAlignment="Left" Margin="6,662,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="52" Width="447"/>
            </Grid>

            <local:LoadingControl x:Name="pb" HorizontalAlignment="Left" Margin="10,377,0,0" VerticalAlignment="Top" Width="460"/>

        </Grid>
    </ScrollViewer>
</phone:PhoneApplicationPage>

我尝试将所有控件的宽度设置为自动，但没有成功。

感谢