title: Cancel Unloaded event in a WPF application
body: <p>I implemented a WPF application which use NavigationService to navigate between pages.<br />
  When I switch from a page to another one, the Unloaded event is raised for each graphical element that belongs to the former page.<br />
  Is there a way to cancel that event without having access to the graphical elements but only to the container?</p>