“System.Windows.Controls.Grid”不包含“setRow”WP 8项目的定义

我正在尝试为Windows 8 Phone制作一个密码拼图。.NET Framework 是 4.5

我遇到以下错误："System.Windows.Controls.Grid"不包含Grid.setRow（txt，x）中的"setRow"定义;我想动态创建文本框，而不使用 XAML...

据我所知，Windows.Controls.Grid有一个静态方法Grid.setRow（UIelement，int）。

这是MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using Microsoft.Phone.Controls;
using System.Windows.Resources;
using System.IO;
namespace CryptogramPuzzle
{
public partial class MainPage : PhoneApplicationPage
{
    List<string> quotes;
    List<TextBox> tb;
    int length = 0;
    int width;
    int height;
    // Constructor
    public MainPage()
    {
        InitializeComponent();
        Random r = new Random();
        string encodedStr;
        InitializeComponent();
        getQuotes();
        int rInt = r.Next(0, quotes.Count()); //generates random index for a quote selection
        encodedStr = Encryption.encode(quotes[rInt]);
        length = encodedStr.Length;
        createTxtBox(0, 0);
    }
    /// <summary>
    /// Loads quotes from the text file
    /// </summary>
    public void getQuotes()
    {
        quotes = new List<string>();
        try
        {
            StreamResourceInfo sInfo = Application.GetResourceStream(new Uri("/CryptogramPuzzle;component/Resources/Puzzles.txt", UriKind.Relative));
            StreamReader sr = new StreamReader(sInfo.Stream);//feeds the reader with the stream
            string line;
            while ((line = sr.ReadLine()) != null)
            {
                quotes.Add(line);
            }
            sr.Close();
            // System.Console.WriteLine(quotes[0]);
        }
        catch (Exception e)
        {
            throw (e);
        }
    }
    public void createTxtBox(int x, int y)
    {
        TextBox txt = new TextBox();
        RowDefinition newRow = new RowDefinition();
        newRow.Height = new GridLength(0, GridUnitType.Auto);
        ContentPanel.RowDefinitions.Add(newRow);
        txt.MinHeight = 10;
        txt.MinHeight = 10;
        ContentPanel.Children.Add(txt);
        Grid.setRow(txt, x);
    }

}
 }

这是我的主页.xaml：

<phone:PhoneApplicationPage
x:Class="CryptogramPuzzle.MainPage"
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"
mc:Ignorable="d"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <!-- LOCALIZATION NOTE:
        To localize the displayed strings copy their values to appropriately named
        keys in the app's neutral language resource file (AppResources.resx) then
        replace the hard-coded text value between the attributes' quotation marks
        with the binding clause whose path points to that string name.
        For example:
            Text="{Binding Path=LocalizedResources.ApplicationTitle, Source={StaticResource LocalizedStrings}}"
        This binding points to the template's string resource named "ApplicationTitle".
        Adding supported languages in the Project Properties tab will create a
        new resx file per language that can carry the translated values of your
        UI strings. The binding in these examples will cause the value of the
        attributes to be drawn from the .resx file that matches the
        CurrentUICulture of the app at run time.
     -->
    <!--TitlePanel contains the name of the application and page title-->
    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
        <TextBlock Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}" Margin="12,0"/>
        <TextBlock Text="page name" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
    </StackPanel>
    <!--ContentPanel - place additional content here-->
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
    </Grid>
    <!--Uncomment to see an alignment grid to help ensure your controls are
        aligned on common boundaries.  The image has a top margin of -32px to
        account for the System Tray. Set this to 0 (or remove the margin altogether)
        if the System Tray is hidden.
        Before shipping remove this XAML and the image itself.-->
    <!--<Image Source="/Assets/AlignmentGrid.png" VerticalAlignment="Top" Height="800" Width="480" Margin="0,-32,0,0" Grid.Row="0" Grid.RowSpan="2" IsHitTestVisible="False" />-->
</Grid>

请帮我修复这个错误，变得非常绝望！谢谢。