<Window x:Class="TestRad2343.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    WindowStartupLocation="CenterScreen"
    Title="Window1" Height="350" Width="300">
    <Window.Resources>
        <Style TargetType="{x:Type GroupBox}" x:Key="GroupBoxMain">
            <Setter Property="Padding" Value="10" />
            <Setter Property="Margin" Value="0 0 0 10" />
            <Setter Property="BorderBrush" Value="#ccc" />
            <Setter Property="BorderThickness" Value="2" />
        </Style>
        <Style TargetType="{x:Type TextBlock}" x:Key="GroupBoxHeaderMain">
            <Setter Property="FontFamily" Value="Lucida Sans" />
            <Setter Property="FontSize" Value="12" />
            <Setter Property="Foreground" Value="#aaa" />
        </Style>

    </Window.Resources>

    <StackPanel Margin="10" HorizontalAlignment="Left">

        <GroupBox Style="{DynamicResource GroupBoxMain}" Margin="0 0 0 10">
            <GroupBox.Header>
                <TextBlock Text="Switch the Chooser"
                                    Style="{DynamicResource GroupBoxHeaderMain}"/>
            </GroupBox.Header>
            <StackPanel>
                <StackPanel HorizontalAlignment="Left" VerticalAlignment="Top" >
                    <Button x:Name="ButtonForDropDown" Content="Drop Down" Padding="3" Margin="0 0 0 3" Click="Button_Click_DropDown"/>
                    <Button x:Name="ButtonForRadioButtonsHorizontal" Content="Radio Buttons Horizontal" Padding="3" Margin="0 0 0 3" Click="Button_Click_RadioButtonsHorizontal" />
                    <Button x:Name="ButtonForRadioButtonsVertical" Content="Radio Buttons Vertical" Padding="3" Margin="0 0 0 3"    Click="Button_Click_RadioButtonsVertical"/>
                </StackPanel>
            </StackPanel>
        </GroupBox>

        <StackPanel HorizontalAlignment="Left" Margin="0 0 0 10">
            <ContentControl x:Name="ControlArea"/>
        </StackPanel>

        <StackPanel HorizontalAlignment="Left" Margin="0 0 0 10">
            <Button x:Name="SubmitButton" Content="Submit" Click="Button_Click_Submit"/>
        </StackPanel>

        <TextBlock x:Name="Message" Foreground="Blue" Margin="0 0 0 10"/>
    </StackPanel>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Globalization;
using System.ComponentModel;

namespace TestRad2343
{
    public partial class Window1 : Window, INotifyPropertyChanged
    {
        #region ViewModelProperty: SelectedIdCode
        private string _selectedIdCode;
        public string SelectedIdCode
        {
            get
            {
                return _selectedIdCode;
            }

            set
            {
                _selectedIdCode = value;
                OnPropertyChanged("SelectedIdCode");
            }
        }
        #endregion //test

        private ChooserDirection chooserDirection = new ChooserDirection();
        private ChooserKind chooserKind = new ChooserKind();

        private string choices = "one, two, three, four, five, six";

        public Window1()
        {
            InitializeComponent();

            chooserKind = ChooserKind.RadioButtons;
            chooserDirection = ChooserDirection.Vertical;
            ManageButtonEnabling("radioButtonsVertical");
            SelectedIdCode = "two";

            RefreshPage();
        }

        void RefreshPage()
        {
            WrapPanel wp = new WrapPanel();
            ChooserGroup chooserGroup = new ChooserGroup("chooser1", choices, SelectedIdCode);
            chooserGroup.ChooserKind = chooserKind;
            chooserGroup.ChooserDirection = chooserDirection;
            ControlArea.Content = chooserGroup.Render();
            chooserGroup.OnChoiceItemChanged += new ChooserGroup.ChoiceItemChangedHandler(chooserGroup_OnChoiceItemChanged);

            SubmitButton.Tag = chooserGroup;
        }

        void chooserGroup_OnChoiceItemChanged(object sender, ChoiceItemArgs args)
        {
            ChooserGroup chooserGroup = sender as ChooserGroup;
            SelectedIdCode = chooserGroup.GetSelectedIdCode();
        }

        private void Button_Click_Submit(object sender, RoutedEventArgs e)
        {
            ChooserGroup chooserGroup = ((Button)sender).Tag as ChooserGroup;
            Message.Text = String.Format("You selected '{0}'.", chooserGroup.GetSelectedIdCode());
        }

        private void Button_Click_DropDown(object sender, RoutedEventArgs e)
        {
            chooserKind = ChooserKind.DropDown;
            ManageButtonEnabling("dropDown");
            RefreshPage();
        }

        private void Button_Click_RadioButtonsHorizontal(object sender, RoutedEventArgs e)
        {
            chooserKind = ChooserKind.RadioButtons;
            chooserDirection = ChooserDirection.Horizontal;
            ManageButtonEnabling("radioButtonsHoriztonal");
            RefreshPage();
        }

        private void Button_Click_RadioButtonsVertical(object sender, RoutedEventArgs e)
        {
            chooserKind = ChooserKind.RadioButtons;
            chooserDirection = ChooserDirection.Vertical;
            ManageButtonEnabling("radioButtonsVertical");
            RefreshPage();
        }

        public void ManageButtonEnabling(string buttonToEnable)
        {
            switch (buttonToEnable)
            {
                case "dropDown":
                    ButtonForDropDown.IsEnabled = false;
                    ButtonForRadioButtonsHorizontal.IsEnabled = true;
                    ButtonForRadioButtonsVertical.IsEnabled = true;
                    break;
                case "radioButtonsHoriztonal":
                    ButtonForDropDown.IsEnabled = true;
                    ButtonForRadioButtonsHorizontal.IsEnabled = false;
                    ButtonForRadioButtonsVertical.IsEnabled = true;
                    break;
                case "radioButtonsVertical":
                    ButtonForDropDown.IsEnabled = true;
                    ButtonForRadioButtonsHorizontal.IsEnabled = true;
                    ButtonForRadioButtonsVertical.IsEnabled = false;
                    break;
                default:
                    break;
            }
        }

        #region INotifiedProperty Block
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion //test

    }

    public class ChooserGroup
    {
        public ChooserDirection ChooserDirection { get; set; }
        public ChooserKind ChooserKind { get; set; }

        private string idCode;
        private List<ChoiceItem> choiceItems = new List<ChoiceItem>();
        private List<RadioButton> internalRadioButtons = new List<RadioButton>();
        private ComboBox internalComboBox = new ComboBox();
        private List<ComboBoxItem> internalComboBoxItems = new List<ComboBoxItem>();


        public delegate void ChoiceItemChangedHandler(object obj, ChoiceItemArgs args);
        public event ChoiceItemChangedHandler OnChoiceItemChanged;


        public ChooserGroup(string chooserIdCode, string choiceList, string selectedChoice)
        {
            idCode = chooserIdCode;
            List<string> choices = choiceList.BreakIntoParts(',');
            choiceItems = ChoiceItem.GetChoiceItemsWithStringList(choices, selectedChoice);
            ChooserKind = ChooserKind.RadioButtons;
            ChooserDirection = ChooserDirection.Vertical;
        }

        public StackPanel Render()
        {
            switch (ChooserKind)
            {
                case ChooserKind.RadioButtons:
                    return RenderAsRadioButtons();
                case ChooserKind.DropDown:
                    return RenderAsDropDown();
                default:
                    return new StackPanel();
            }
        }

        StackPanel RenderAsDropDown()
        {
            StackPanel spWrapper = new StackPanel();
            int index = 0;
            foreach (var choiceItem in choiceItems)
            {
                ComboBoxItem comboBoxItem = new ComboBoxItem { Tag = choiceItem.IdCode, Content = choiceItem.Title };
                internalComboBox.Items.Add(comboBoxItem);
                if (choiceItem.IsSelected)
                    internalComboBox.SelectedIndex = index;
                index++;
                internalComboBoxItems.Add(comboBoxItem);
            }
            if (internalComboBox.SelectedItem == null)
            {
                if (internalComboBox.Items.Count > 0)
                    internalComboBox.SelectedItem = internalComboBox.Items[0];
            }
            spWrapper.Children.Add(internalComboBox);

            internalComboBox.SelectionChanged += new SelectionChangedEventHandler(internalComboBox_SelectionChanged);

            return spWrapper;

        }

        void internalComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ChoiceItemArgs args = new ChoiceItemArgs("");
            OnChoiceItemChanged(this, args);
        }

        StackPanel RenderAsRadioButtons()
        {
            StackPanel spWrapper = new StackPanel();

            StackPanel spDirectionWrapper = new StackPanel();
            WrapPanel wpDirectionWrapper = new WrapPanel();

            foreach (var choiceItem in choiceItems)
            {
                RadioButton rb = new RadioButton();
                rb.Content = choiceItem.Title;
                rb.Tag = choiceItem.IdCode;
                rb.GroupName = idCode;
                rb.Cursor = Cursors.Hand;
                if (choiceItem.IsSelected)
                    rb.IsChecked = true;
                else
                    rb.IsChecked = false;

                if (ChooserDirection == ChooserDirection.Horizontal)
                {
                    rb.Margin = new Thickness(5);
                    wpDirectionWrapper.Children.Add(rb);
                }
                else
                {
                    spDirectionWrapper.Children.Add(rb);
                }
                rb.Checked += new RoutedEventHandler(rb_Checked);
                internalRadioButtons.Add(rb);
            }

            if (ChooserDirection == ChooserDirection.Horizontal)
                spWrapper.Children.Add(wpDirectionWrapper);
            else
                spWrapper.Children.Add(spDirectionWrapper);

            return spWrapper;
        }

        void rb_Checked(object sender, RoutedEventArgs e)
        {
            ChoiceItemArgs args = new ChoiceItemArgs("");
            OnChoiceItemChanged(this, args);
        }

        public string GetSelectedIdCode()
        {
            switch (ChooserKind)
            {
                case ChooserKind.RadioButtons:
                    return GetSelectedIdCodeFromRadioButtons();
                case ChooserKind.DropDown:
                    return GetSelectedIdCodeFromDropDown();
                default:
                    return "";
            }
        }

        string GetSelectedIdCodeFromRadioButtons()
        {
            foreach (var internalRadioButton in internalRadioButtons)
            {
                if (internalRadioButton.IsChecked.Value)
                    return internalRadioButton.Tag.ToString();
            }
            return null;
        }

        string GetSelectedIdCodeFromDropDown()
        {
            int selectedIndex = internalComboBox.SelectedIndex;
            ComboBoxItem selectedComboBoxItem = internalComboBoxItems[selectedIndex];
            return selectedComboBoxItem.Tag.ToString();
        }
    }

    public class ChoiceItemArgs : EventArgs
    {
        public string Message { get; set; }

        public ChoiceItemArgs(string message)
        {
            Message = message;
        }
    }

    public enum ChooserDirection
    {
        Horizontal,
        Vertical
    }

    public enum ChooserKind
    {
        DropDown,
        RadioButtons
    }

    public class ChoiceItem
    {
        public string IdCode { get; set; }
        public string Title { get; set; }
        public bool IsSelected { get; set; }

        public static List<ChoiceItem> GetChoiceItemsWithStringList(List<string> rawChoices, string selectedValue)
        {
            if (rawChoices == null)
                return null;
            List<ChoiceItem> choiceItems = new List<ChoiceItem>();
            foreach (var rawChoice in rawChoices)
            {
                ChoiceItem ci = new ChoiceItem();
                ci.IdCode = rawChoice;
                TextInfo text = new CultureInfo("en-US", false).TextInfo;
                ci.Title = text.ToTitleCase(rawChoice);
                if (ci.IdCode == selectedValue)
                    ci.IsSelected = true;
                choiceItems.Add(ci);
            }
            return choiceItems;
        }
    }

    public static class StringHelpers
    {
        public static List<string> BreakIntoParts(this string line, char separator)
        {
            if (String.IsNullOrEmpty(line))
                return null;
            else
                return line.Split(separator).Select(p => p.Trim()).ToList();
        }
    }
}