WPF Breadcrumb Folder TextBox

using System;
using System.Collections.Generic;
using System.Windows.Data;
using System.Globalization;
using System.Windows.Input;
using System.IO;
using System.Diagnostics;
using QuickZip.UserControls.Breadcrumb.Framework;

namespace QuickZip.UserControls.Breadcrumb.Tools
{
    [ValueConversion(typeof(string), typeof(string))]
    public class DisplayToLogicalPathConverter : IValueConverter
    {
        BreadcrumbItemBase _root = null;

        public DisplayToLogicalPathConverter(BreadcrumbItemBase root) : base()
        {
            _root = root;
        }

        #region IValueConverter Members              

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (_root == null) return "";

            return _root.ConvertPath(BreadcrumbItemBase.PathType.ptDisplay, value as string);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (_root == null) return "";

            return _root.ConvertPath(BreadcrumbItemBase.PathType.ptFolder, value as string);
        }

        #endregion
    }
}