文本框不适用于Windows Phone 8.1 App

Question

在模拟器和Windows手机设备中单击时，我无法在文本框中输入用户。我删除了所有文本框，并将其替换为没有任何特殊偏好的新文本框，但仍然无法正常工作。我已经实现了我的应用程序的整个界面，需要帮助来解决这个问题并开始使用服务器连接。其余的控件都可以正常工作。请问任何想法？

This is the corresponding interface of the code I am posting below.

这是我的mainpage.xaml代码：如果您还有其他需要，请告诉我。

    <controls:ViewPage
x:Class="Menu_and_Topbar_app__Windows_Phone_8._1_3.MainPage"
xmlns:controls="using:Menu_and_Topbar_app__Windows_Phone_8._1_3.Controls"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Menu_and_Topbar_app__Windows_Phone_8._1_3"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">

<Grid Background="#FF250D5C">
    <ScrollViewer HorizontalAlignment="Center" 
                  VerticalAlignment="Center"
                  Margin="5.857,6.897,8.265,12.783" RenderTransformOrigin="0.5,0.5" Height="620.32" UseLayoutRounding="False" Width="385.878" d:LayoutRounding="Auto">
        <ScrollViewer.RenderTransform>
            <CompositeTransform Rotation="0.309"/>
        </ScrollViewer.RenderTransform>

        <Pivot Name="MyPivot" IsEnabled="True" IsTapEnabled="True">
            <Pivot.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding}"  FontSize="37" SelectionHighlightColor="#FF898888" />
                </DataTemplate>
            </Pivot.HeaderTemplate>

            <PivotItem x:Name="PivotItem1"  Header="Sign In" IsEnabled="True" IsTapEnabled="True">
                <Grid HorizontalAlignment="Left" Height="496" Margin="18,19,0,0" VerticalAlignment="Top" Width="311" IsTapEnabled="True" IsRightTapEnabled="True">
                    <Image x:Name="image" HorizontalAlignment="Left" Height="70" Margin="64,9,0,0" VerticalAlignment="Top" Width="193" Source="/Menu and Topbar app (Windows Phone 8.1)3/Pictures/logo.png" Visibility="Visible" />
                    <Button x:Name="button" Content="Log In" HorizontalAlignment="Left" Margin="98,409,0,0" VerticalAlignment="Top" Click="button_Click_1"/>
                    <TextBlock x:Name="textBlock"  HorizontalAlignment="Left" Margin="16,113,0,0" TextWrapping="Wrap" Text="Username or Email:" VerticalAlignment="Top" FontSize="16"/>
                    <TextBlock x:Name="textBlock2"  HorizontalAlignment="Left" Margin="16,210,0,0" TextWrapping="Wrap" Text="Password:" VerticalAlignment="Top" FontSize="16"/>


                    <HyperlinkButton Content="Sign Up for SCP?" HorizontalAlignment="Left" Margin="17,266,0,0" VerticalAlignment="Top" FontSize="13.333" NavigateUri="http://scponline.azurewebsites.net/Home/LoginPartialView"/>
                    <CheckBox x:Name="checkBox" Content="Remember me?" HorizontalAlignment="Left" Margin="17,312,0,0" VerticalAlignment="Top"/>
                    <TextBox x:Name="textBox" HorizontalAlignment="Left" Margin="17,137,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="275" GotFocus="textBox_GotFocus" AllowDrop="True" />

                </Grid>
            </PivotItem>


            <PivotItem x:Name="PivotItem2" Header="Sign Up" >
                <Grid HorizontalAlignment="Left" Height="496" Margin="18,19,0,0" VerticalAlignment="Top" Width="311">
                    <Button Content="Sign Up" HorizontalAlignment="Left" Margin="97,437,0,0" VerticalAlignment="Top" Click="Button_Click_2"/>
                    <TextBlock x:Name="textBlock3"  HorizontalAlignment="Left" Margin="16,108,0,0" TextWrapping="Wrap" Text="Email:" VerticalAlignment="Top" FontSize="16"/>
                    <TextBlock x:Name="textBlock4"  HorizontalAlignment="Left" Margin="16,168,0,0" TextWrapping="Wrap" Text="Password:" VerticalAlignment="Top" FontSize="16"/>
                    <TextBox x:Name="textBox3" HorizontalAlignment="Left" Margin="16,126,0,0" TextWrapping="Wrap" Text="username@mail.com" VerticalAlignment="Top" Height="0" Width="276" FontSize="17.593" RenderTransformOrigin="0.5,0.5">
                        <TextBox.RenderTransform>
                            <CompositeTransform ScaleY="0.9"/>
                        </TextBox.RenderTransform>
                    </TextBox>
                    <TextBox x:Name="textBox4" HorizontalAlignment="Left" Margin="16,187,0,0" TextWrapping="Wrap" Text="***********" VerticalAlignment="Top" Height="0" Width="276" TextChanged="textBox2_TextChanged" FontSize="17.593" RenderTransformOrigin="0.5,0.5">
                        <TextBox.RenderTransform>
                            <CompositeTransform ScaleY="0.9"/>
                        </TextBox.RenderTransform>
                    </TextBox>
                    <Image x:Name="image1" HorizontalAlignment="Left" Height="70" Margin="64,9,0,0" VerticalAlignment="Top" Width="193" Source="/Menu and Topbar app (Windows Phone 8.1)3/Pictures/logo.png"/>
                    <TextBlock x:Name="textBlock1" HorizontalAlignment="Left" Margin="16,232,0,0" TextWrapping="Wrap" Text="Name:" VerticalAlignment="Top" SelectionChanged="textBlock1_SelectionChanged" FontSize="16"/>
                    <TextBox x:Name="textBox5" HorizontalAlignment="Left" Margin="16,250,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Height="0" Width="276" TextChanged="textBox2_TextChanged" FontSize="17.593" RenderTransformOrigin="0.5,0.5">
                        <TextBox.RenderTransform>
                            <CompositeTransform ScaleY="0.9"/>
                        </TextBox.RenderTransform>
                    </TextBox>

                    <TextBlock x:Name="textBlock5" HorizontalAlignment="Left" Margin="16,292,0,0" TextWrapping="Wrap" Text="Name:" VerticalAlignment="Top" SelectionChanged="textBlock1_SelectionChanged" FontSize="16"/>
                    <TextBox x:Name="textBox6" HorizontalAlignment="Left" Margin="16,310,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Height="0" Width="276" TextChanged="textBox2_TextChanged" FontSize="17.593" RenderTransformOrigin="0.5,0.5">
                        <TextBox.RenderTransform>
                            <CompositeTransform ScaleY="0.9"/>
                        </TextBox.RenderTransform>
                    </TextBox>
                </Grid>
            </PivotItem>

        </Pivot>


    </ScrollViewer>



</Grid>