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ListView Data-Binding problem

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Hi, I have some troubles with my program.
I have set the binding for my listview, but when I setup my app and push the button to add an item in the collection nothing is happening.

What's wrong?

Here comes my C# code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Forms;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;
using System.Collections.ObjectModel;


namespace Morse_Mail
{
    /// <summary>
    /// Iteration logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {

        public ObservableCollection<Message> Messages { get; set; }



        public MainWindow()
        {
            this.Messages = new ObservableCollection<Message>();

            InitializeComponent();

            DataContext = Messages;
        }



        private void start_Button_Click(object sender, RoutedEventArgs e)
        {

// some code here
                Message msg = new Message(ISubject, IDate, ISender, IID);

                Messages.Add(msg);

            }
        }



    }

    public class Message : INotifyPropertyChanged
    {
        private string subject;
        private string date;
        private string sender;
        private string id;

        public string Subject
        {
            get { return subject; }
            set { subject = value; OnPropertyChanged("Subject"); }
        }
        public string Date
        {
            get { return date; }
            set { date = value; OnPropertyChanged("Date"); }
        }
        public string Sender
        {
            get { return sender; }
            set { sender = value; OnPropertyChanged("Sender"); }
        }
        public string ID
        {
            get { return id; }
            set { id = value; OnPropertyChanged("ID"); }
        }


        public Message(string _Subject, string _Date, string _Sender, string _ID) 
        {
            Subject = _Subject;
            Date = _Date;
            Sender = _Sender;
            ID = _ID;
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

And here comes Xaml code:

<Window x:Class="Morse_Mail.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="864.5" Width="1203.5" ResizeMode="NoResize" Title="Morse Mail" WindowStartupLocation="CenterScreen"><Grid Height="830" VerticalAlignment="Top"><ListView x:Name="ListView" HorizontalAlignment="Left" Height="704" Margin="47,39,0,0" VerticalAlignment="Top" Width="600" 
                  IsSynchronizedWithCurrentItem="True" 
                  ItemsSource="{Binding Messages}"><ListView.View ><GridView AllowsColumnReorder="true"><GridViewColumn Width="300" Header="Subject" 
                                    DisplayMemberBinding="{Binding Subject}"/><GridViewColumn Width="150" Header="Date" 
                                    DisplayMemberBinding="{Binding Date}"/><GridViewColumn Width="120" Header="Sender" 
                                    DisplayMemberBinding="{Binding Sender}"/><GridViewColumn Width="20" Header="ID" 
                                    DisplayMemberBinding="{Binding ID}"/></GridView></ListView.View></ListView></Grid></Window>

Help me, please!





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