protected override void OnTabCommmand(TabItem tab)
 {
     if (tab != null)
     {
         if (string.Equals(tab.Name, "movies"))
         {
             NavigateToAllMoviesInternal();
         }
         else if (string.Equals(tab.Name, "tvshows"))
         {
             NavigateToAllShowsInternal();
         }
     }
 }
 protected virtual void OnTabCommmand(TabItem tab)
 {
     
 }
 protected virtual void OnTabCommmand(TabItem tab)
 {
 }