public MainActivityViewModel(IPlatformProviders providers) : base(providers)
        {

        }
 public virtual FrameworkPageViewModel InstantiatePageViewModel(Type viewModelType, IPlatformProviders providers)
 {
     return Activator.CreateInstance(viewModelType, providers) as FrameworkPageViewModel;
 }
 public FrameworkPageViewModel(IPlatformProviders arguments)
 {
     Navigation = arguments.WindowProviders.Navigation;
     Synchronization = arguments.WindowProviders.Synchronization;
     Resources = arguments.WindowProviders.Resources;
 }