WPF-控件-ControlTemplate生成的控件

<Window x:Class="由ControlTemplate生成的控件.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <ControlTemplate x:Key="cTemp">
            <StackPanel Background="Orange">
                <TextBox x:Name="textBox1" Margin="6"/>
                <TextBox x:Name="textBox2" Margin="6"/>
                <TextBox x:Name="textBox3" Margin="6"/>
            </StackPanel>
        </ControlTemplate>
    </Window.Resources>
    <StackPanel Background="Yellow">
        <UserControl x:Name="uc" Template="{StaticResource cTemp}" Margin="5"/>
        <Button Content="Find By Name" Width="120" Height="30" Click="ButtonBase_OnClick"></Button>
    </StackPanel>
</Window>

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            TextBox tb = this.uc.Template.FindName("textBox1", this.uc) as TextBox;
            tb.Text = "Hello WPF";
            StackPanel sp = tb.Parent as StackPanel;
            (sp.Children[] as TextBox).Text = "Hello ControlTemplate";
            (sp.Children[] as TextBox).Text = "I can find you !";
        }