title: Prism INavigationAware invoked on perant view model when navigating in child region
body: <p>I experience a weird behavior when trying to navigate to a view in a child region the OnNavigatingFrom and OnNavigatingTo is being invoked on the parent view model</p>
  
  <p>My layout is as follows I have a shell with a content region where I load a view that has a panel region when I want to change the view from the panel region <code>_regionManager.RequestNavigate("PanelRegion", "ViewB");</code>  the INavigationAware is being invoked on the content regions view-viewmodel </p>