title: Composite Models with INotifyPropertyChanged - PostSharp Delegate Changes from SubModels
body: <p>First of all, I do use the NotifyPropertyChanged implementation for Change handling and not MVVM implementation.</p>
  
  <p>That said i have the following construct: </p>
  
  <pre><code>[NotifyPropertyChanged]
  public interface ISpecimen : INotifyPropertyChanged
  {
      string Name { get; }
      IOpticModel Optics { get; }
  }
  
  [NotifyPropertyChanged]
  public interface IOpticModel : INotifyPropertyChanged
  {
      string Lens { get; }
      void UpdateOptics(string lens);
  }
  </code></pre>
  
  <p>Now I want PostSharp to Notify me that the Specimen Property Optics got changed (or more precise modified) when I Update the Lens of the IOpticModel. How can i achieve that? Is there anything already ready to go or do i need to create a custom Aspect for that?</p>
  
  <p>I did expect something like that to be ready to use but may be just to blind to find it in the Docs.</p>