win10 uwp 弹起键盘不隐藏界面元素

<Grid>
            <Grid.RowDefinitions>
                <RowDefinition></RowDefinition>
                <!--显示虚拟键盘 他的高度会为虚拟键盘高度-->
                <RowDefinition x:Name="HightKeyboard" Height="Auto"></RowDefinition>
            </Grid.RowDefinitions>
            <!--这里才是原本的界面-->
            <!--原本的使用VerticalAlignment="Center"-->
            <Grid>
                <!--这里写界面-->
                <StackPanel Orientation="Vertical"
                          VerticalAlignment="Center">
                    <TextBlock Text="我是界面"
                         HorizontalAlignment="Center"></TextBlock>
                    <TextBox Margin="10,10,10,10" Header="输入"></TextBox>
                    <TextBlock Margin="10,100,10,10" Text="手机点击输入 会隐藏我"
                               HorizontalAlignment="Center"></TextBlock>
                    <TextBlock></TextBlock>
                </StackPanel>
            </Grid>
        </Grid>

            InputPane.GetForCurrentView().Showing += (s, e) =>
            {
                HightKeyboard.Height=new GridLength(e.OccludedRect.Height);
            };

            InputPane.GetForCurrentView().Hiding += (s, e) =>
            {
                HightKeyboard.Height=new GridLength(1);
            };