WPF 如其遍历Grid中所有控件？

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="100" />
            <RowDefinition Height="35"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
        </Grid.ColumnDefinitions>
        <Button x:Name="btnClick" Margin="50,0,50,0" Grid.Row="1" Grid.Column="0" Content="Click Me" Click="btnClick_Click" />
        <Grid Grid.Row="0" Grid.Column="0" x:Name="Grid1">
        </Grid>
    </Grid>

public Window1()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(Window1_Loaded);
        }

        void Window1_Loaded(object sender, RoutedEventArgs e)
        {
            RowDefinition rd = new RowDefinition();
            Grid1.RowDefinitions.Add(rd);
            //添加第0列
            Border b = new Border();
            b.BorderThickness = new Thickness(0, 0, 1, 1);
            b.BorderBrush = Brushes.Black;
            b.Name = "Border_" + (Grid1.RowDefinitions.Count - 1) + "_0";

            TextBox tb = new TextBox();
            string x = "TB_" + (Grid1.RowDefinitions.Count - 1) + "_0";
            tb.Name = "TB_" + (Grid1.RowDefinitions.Count - 1) + "_0";
            tb.BorderThickness = new Thickness(0);
            tb.ToolTip = tb.Name;
            b.Child = tb;//
            b.SetValue(Grid.RowProperty, Grid1.RowDefinitions.Count - 1);
            b.SetValue(Grid.ColumnProperty, 0);
            Grid1.Children.Add(b);

        }

        private void btnClick_Click(object sender, RoutedEventArgs e)