Make it possible to raise page events (NavigatingFrom, NavigatedFrom, NavigatingTo and NavigatedTo) from page descendants

Description

I develop custom controls and need to raise such events in my custom page implementations (like flyouts etc).

Public API Changes

It should be added some methods to Page class to raise Navigated events

public class Page: ... {
    protected void RaiseNavigatedTo(NavigatedToEventArgs args)
    {
        NavigatedTo?.Invoke(this, args);			
    }

    protected void RaiseNavigatingFrom(NavigatingFromEventArgs args)
    {
        NavigatingFrom?.Invoke(this, args);
    }

    protected void SendNavigatedFrom(NavigatedFromEventArgs args)
    {
        NavigatedFrom?.Invoke(this, args);
    }
}

Intended Use-Case

I develop custom controls and need to raise such events.

public class MyCustomContainerPage : Page {
     //.....

      void OnMyContentChanged(Page oldContent, Page newContent) {
         //. .....
         //
         oldContent?.RaiseNavigatedFrom(new NavigatedFromEventArgs(newContent));
 	 newContent?.RaiseNavigatedTo(new NavigatedToEventArgs(oldContent));
      }
}

Start by locating the Page class and its existing NavigatingFrom, NavigatedFrom, NavigatingTo, and NavigatedTo event declarations. Trace how navigation currently raises them, then determine how protected raiser methods should support custom Page descendants and verify that the intended custom-container scenario can raise the events.