Get XmlElement from Bounded view

   
  
<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:local="clr-namespace:WpfApplication1"
  Title="XmlBinding" Height="325" Width="400">
  <Window.Resources>
    <local:AgeToForegroundConverter x:Key="ageConverter" />
  </Window.Resources>
  <StackPanel Name="stackPanel">
    <ListBox ItemsSource="{Binding}" IsSynchronizedWithCurrentItem="True">
      <ListBox.GroupStyle>
        <x:Static Member="GroupStyle.Default" />
      </ListBox.GroupStyle>
      <ListBox.ItemTemplate>
        <DataTemplate>
          <TextBlock>
            <TextBlock Text="{Binding XPath=@Name}" />
            (age: <TextBlock Text="{Binding XPath=@Age}" Foreground="{Binding XPath=@Age, Converter={StaticResource ageConverter}}" />)
          </TextBlock>
        </DataTemplate>
      </ListBox.ItemTemplate>
    </ListBox>
    <TextBlock>Name:</TextBlock>
    <TextBox Text="{Binding XPath=@Name}" />
    <TextBlock>Age:</TextBlock>
    <TextBox Text="{Binding XPath=@Age}" Foreground="{Binding XPath=@Age, Converter={StaticResource ageConverter}}" />
    <Button Name="birthdayButton">Birthday</Button>
  </StackPanel>
</Window>
//File:Window.xaml.cs
using System;
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.Shapes;
using System.Collections.Generic;
using System.Diagnostics;
using System.Collections;
using System.Data;
using System.Data.OleDb;
using System.ComponentModel;
using System.Xml;

namespace WpfApplication1
{
    public class AgeToForegroundConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Debug.Assert(targetType == typeof(Brush));
            int age = int.Parse(value.ToString());
            return (age > 60 ? Brushes.Red : Brushes.Black);
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }


    public partial class Window1 : Window
    {
        XmlDocument doc;
        public Window1()
        {
            InitializeComponent();

            doc = new XmlDocument();
            doc.LoadXml(@"<Company xmlns=&#039;http://company.com&#039;>
  <Employee Name=&#039;A&#039; Age=&#039;61&#039; />
  <Employee Name=&#039;B&#039; Age=&#039;72&#039; />
  <Employee Name=&#039;C&#039; Age=&#039;38&#039; />
</Company>");

            XmlNamespaceManager manager = new XmlNamespaceManager(doc.NameTable);
            manager.AddNamespace("sb", "http://company.com");
            Binding.SetXmlNamespaceManager(stackPanel, manager);

            Binding b = new Binding();
            b.XPath = "/sb:Company/sb:Employee";
            b.Source = doc;
            stackPanel.SetBinding(StackPanel.DataContextProperty, b);

            this.birthdayButton.Click += birthdayButton_Click;

        }

        void birthdayButton_Click(object sender, RoutedEventArgs e) {
      ICollectionView view = CollectionViewSource.GetDefaultView(stackPanel.DataContext);

      XmlElement person = (XmlElement)view.CurrentItem;
      person.SetAttribute("Age",(int.Parse(person.Attributes["Age"].Value) + 1).ToString());
      Console.WriteLine(person.Attributes["Name"].Value);
      Console.WriteLine(person.Attributes["Age"].Value);
    }
    }
}