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copied!<p>If you want to child objects to see as if they are part of a their parent directly you need to do the bubbling yourself.</p> <p>For your example, you would be binding to 'Address.Street' in your view, so you need to bubble a notifypropertychanged containing that string.</p> <p>I wrote an easy helper to do this. You just call BubblePropertyChanged(x => x.BestFriend) in your parent view model constructor. n.b. there is an assumption you have a method called NotifyPropertyChanged in your parent, but you can adapt that to suit.</p> <pre><code> /// <summary> /// Bubbles up property changed events from a child viewmodel that implements {INotifyPropertyChanged} to the parent keeping /// the naming hierarchy in place. /// This is useful for nested view models. /// </summary> /// <param name="property">Child property that is a viewmodel implementing INotifyPropertyChanged.</param> /// <returns></returns> public IDisposable BubblePropertyChanged(Expression<Func<INotifyPropertyChanged>> property) { // This step is relatively expensive but only called once during setup. MemberExpression body = (MemberExpression)property.Body; var prefix = body.Member.Name + "."; INotifyPropertyChanged child = property.Compile().Invoke(); PropertyChangedEventHandler handler = (sender, e) => { this.NotifyPropertyChanged(prefix + e.PropertyName); }; child.PropertyChanged += handler; return Disposable.Create(() => { child.PropertyChanged -= handler; }); } </code></pre>

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