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I'm trying to simplify some code by putting the ViewModel models into the code behind and binding the DataContext as "this", but it seems to work differently, in the following example: Why is it when the button is clicked, the TextBlock bound to "Message" does not change, even though OnPropertyChanged("Message") is called? XAML: <Window x:Class="TestSimple223.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <StackPanel HorizontalAlignment="Left"> <Button Content="Button" Click="button1_Click" /> <TextBlock Text="{Binding Path=Message, Mode=TwoWay}"/> <TextBlock x:Name="Message2"/> </StackPanel> </Window> Code Behind: using System.Windows; using System.ComponentModel; namespace TestSimple223 { public partial class Window1 : Window { #region ViewModelProperty: Message private string _message; public string Message { get { return _message; } set { _message = value; OnPropertyChanged("Message"); } } #endregion public Window1() { InitializeComponent(); DataContext = this; Message = "original message"; Message2.Text = "original message2"; } private void button1_Click(object sender, RoutedEventArgs e) { Message = "button was clicked, message changed"; Message2.Text = "button was click, message2 changed"; } #region INotify public event PropertyChangedEventHandler PropertyChanged; protected

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