<!--LayoutRoot is the root grid where all page content is placed-->

    <Grid x:Name="LayoutRoot" Background="Transparent" Width="480">

        <Grid.RowDefinitions>

            <RowDefinition Height="Auto"/>

            <RowDefinition Height="*"/>

        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->

        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28" Background="#FF6C1643">

            <TextBlock x:Name="ApplicationTitle" Text="My Application" Style="{StaticResource PhoneTextNormalStyle}"/>

            <TextBlock x:Name="PageTitle" Text="RadioButton Demo" Margin="0,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}" Height="90" Width="424" FontSize="48" Foreground="#FFE8E8EB" AllowDrop="False" />

        </StackPanel>

        <!--ContentPanel - place additional content here-->

        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0" Background="#FF194533">

            <Button Content="Submit" Height="88" HorizontalAlignment="Left" Margin="140,350,0,0" Name="btnSubmit" VerticalAlignment="Top" Width="170" Background="#FF15A7E8" DataContext="{Binding}" AllowDrop="False" UseLayoutRounding="False" VerticalContentAlignment="Center" Click="btnSubmit_Click" />

            <RadioButton Content="Australia" Height="72" Margin="58,74,205,0" Name="rbAustralia" VerticalAlignment="Top" GroupName="gbtnFavourit" BorderBrush="#BF22DE4D" />

            <RadioButton Content="England" Height="72" HorizontalAlignment="Left" Margin="58,152,0,0" Name="rbEngland" VerticalAlignment="Top" GroupName="gbtnFavourit" />

            <RadioButton Content="India" Height="72" HorizontalAlignment="Left" Margin="58,230,0,0" Name="rbIndia" VerticalAlignment="Top" GroupName="gbtnFavourit" />

        </Grid>

    </Grid>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using Microsoft.Phone.Controls;

namespace testPhoneApp

{

    public partial class MainPage : PhoneApplicationPage

    {

        // Constructor

        public MainPage()

        {

            InitializeComponent();

        }

        private void btnSubmit_Click(object sender, RoutedEventArgs e)

        {

            if (Convert.ToBoolean(rbAustralia.IsChecked))

            {

                MessageBox.Show("You have selected team Australia!");

            }

            else if (Convert.ToBoolean(rbEngland.IsChecked))

            {

                MessageBox.Show("You have selected team England!");

            }

            else if (Convert.ToBoolean(rbIndia.IsChecked))

            {

                MessageBox.Show("You have selected team India!");

            }

            else

            {

                MessageBox.Show("You have not selected any item!");

            }

        }

    }

}