RadioButton trong lập trình WPF

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Radio___WPF
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            brMain.Visibility = brMain.Visibility == System.Windows.Visibility.Collapsed? System.Windows.Visibility.Visible :  System.Windows.Visibility.Collapsed;
        }
    }
}
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<Window x:Class="Radio___WPF.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">
    <StackPanel>
        <RadioButton IsChecked="True" Content="www.howkteam.com is your favorite website, don't you?"></RadioButton>
        <RadioButton Content="www.howkteam.com is your most favorite website, don't you?"></RadioButton>
        <RadioButton Content="www.howkteam.com is the best free education website"></RadioButton>

        <Border x:Name="brMain" BorderThickness="3" BorderBrush="Black" Margin="5" Visibility="Collapsed">
            <StackPanel>
                <RadioButton IsChecked="True" Content="www.howkteam.com is your favorite website, don't you?"></RadioButton>
                <RadioButton Content="www.howkteam.com is your most favorite website, don't you?"></RadioButton>
                <RadioButton Content="www.howkteam.com is the best free education website"></RadioButton>
            </StackPanel>
        </Border>
        <Border BorderThickness="3" BorderBrush="Black" Margin="5">
            <StackPanel>
                <RadioButton IsChecked="True" Content="www.howkteam.com is your favorite website, don't you?"></RadioButton>
                <RadioButton Content="www.howkteam.com is your most favorite website, don't you?"></RadioButton>
                <RadioButton Content="www.howkteam.com is the best free education website"></RadioButton>
            </StackPanel>
        </Border>
        <Border BorderThickness="3" BorderBrush="Black" Margin="5">
            <StackPanel>
                <RadioButton IsChecked="True" Content="www.howkteam.com is your favorite website, don't you?"></RadioButton>
                <RadioButton Content="www.howkteam.com is your most favorite website, don't you?"></RadioButton>
                <RadioButton Content="www.howkteam.com is the best free education website"></RadioButton>
            </StackPanel>
        </Border>
        <Button Content="click" Click="Button_Click"></Button>
    </StackPanel>
</Window>
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