WPF Breadcrumb Folder TextBox

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using QuickZip.UserControls.Breadcrumb.Presenter;
using QuickZip.UserControls.Breadcrumb.View;
using QuickZip.UserControls.Breadcrumb.Framework;

namespace BreadcrumbTest2
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {        
        public Window1()
        {
            InitializeComponent();
            this.AddHandler(RadioButton.CheckedEvent, new RoutedEventHandler(RadioButton_Checked));
        }

        private void Animal()
        {
            AnimalPresenter animalRoot = new AnimalPresenter();

            animalRoot.AddRoot();
            animalRoot.Add(new AnimalPresenter(animalRoot, "cat3"));
            animalRoot.Add("cat2\\dog2\\rat2\\cat3\\dog3\\rat3\\");
            animalRoot.AddSeparator();

            breadcrumb.SwitchPresenter(animalRoot);
            breadcrumb.Items.Clear();
        }

        private void Folder()
        {
            FolderPresenter folderRoot = new FolderPresenter();
            folderRoot.AddRoot();
            folderRoot.Add(Environment.UserName + "\\Downloads");            
            folderRoot.AddSeparator();
            
            breadcrumb.SwitchPresenter(folderRoot);               

            //dropdown items.
            breadcrumb.Items.Add("C:\\");
            breadcrumb.Items.Add("C:\\Temp\\");
            breadcrumb.Items.Add("D:\\");
        }

        private void RadioButton_Checked(object sender, RoutedEventArgs e)
        {

            if (e.OriginalSource is RadioButton)
            {
                string root = (e.OriginalSource as RadioButton).Content as string;

                switch (root)
                {
                    case "Animal" :
                        Animal();
                        breadcrumb.SelectedFolder = "cat2\\dog1\\rat3";   
                        break;

                    case "Folder" :
                        Folder();
                        breadcrumb.SelectedFolder = "";         
                        break;
                }
                                                                                                                                                                                 #region Easter egg                
                breadcrumb.IsTrailDirEnabled = root == "Animal"; 
               
                                                                                                                                                                                 #endregion
            }            
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            breadcrumb.RefreshClicked += (RoutedEventHandler)delegate { MessageBox.Show("Refresh clicked."); };
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            Folder();
        }

    }
}