title: The same property in two ViewModels and the property changed
body: <p>I have three ViewModels:
  - MainViewModel,
  - NavigatorViewModel,
  - ProjectViewModel.</p>
  
  <p>In the MainViewModel I have a property called CurrentProject from type ProjectViewModel:</p>
  
  <pre><code>public ProjectViewModel CurrentProject
      {
          get
          {
              return _currentProject;
          }
          set
          {
              if (_currentProject == value)
              {
                  return;
              }
              _currentProject = value;
              RaisePropertyChanged("CurrentProject");
          }
      }
  </code></pre>
  
  <p>In the NavigatorViewModel I have also a property CurrentProject</p>
  
  <pre><code>public ProjectViewModel CurrentProject { get { return ViewModelLocator.DesktopStatic.CurrentProject; } }
  </code></pre>
  
  <p>I use MVVM light. The View NavigatorView doesnt get notified if the property CurrentProject in the MainViewModel is changed.</p>
  
  <p>How can I let the NavigatorView know, that the property has changed?</p>