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[1] as TextBox).Text = "Hello ControlTemplate";
(sp.Children[2] as TextBox).Text = "I can find you !";
}