禁用Windows Phone中scrollviewer的Grid垂直滚动行为

Question

网格结构

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点击文本框并打开键盘然后标题向上滚动..我想修复标题位置（不滚动）

如何解决这个问题？

点击文本框键盘打开但标题向上滚动...

我的xaml代码

<Grid x:Name="grdEmergencyServices" ScrollViewer.VerticalScrollMode="Disabled" >
    <Grid.Background>
        <ImageBrush ImageSource="/Assets/1.png"/>
    </Grid.Background>
    <Grid.RowDefinitions>
        <RowDefinition Height="50*"/>
        <RowDefinition Height="500*"/>
    </Grid.RowDefinitions>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <Border Background="#8C6446" Grid.Row="0" Grid.ColumnSpan="3"/>
        <Grid Grid.Row="0" Background="#8C6446" Opacity="0.8">
            <TextBlock Name="pageTitle" Text="Title Name" Style="                                                                   {StaticResource CommonStyle}"/>
        </Grid>
    </Grid>
    <ProgressRing Grid.Row="1" x:Name="ProgressRingLoad" Visibility="Collapsed" Background="Transparent" IsActive="True" Height="50" HorizontalAlignment="Center" VerticalAlignment="Center" />
    <ScrollViewer Grid.Row="1" Margin="20">
        <TextBox TextWrapping="Wrap" Text="TextBox" Margin="0,500,0,0"/>
    </ScrollViewer>
</Grid>