public UserDetailsPageViewModel(INavigationService navigationService)
     : base(navigationService)
 {
     restService = new RestService();
     IsVisible   = new UserDetailsPageVisibility()
     {
         ActivityIndicator  = true,
         UserData           = false,
         SomethingWentWrong = false
     };
 }
        private async void FillData(int Id)
        {
            var result = await restService.GetUserDetails(Id);

            UserData  = result;
            IsVisible = new UserDetailsPageVisibility()
            {
                ActivityIndicator  = false,
                UserData           = UserData.Id != 0,
                SomethingWentWrong = UserData.Id == 0
            };
        }