protected virtual void NavigateToAccount(GhAccount account)
 {
     if (account is GhUser)
     {
         NavigateToUser((GhUser)account);
     }
 }
        protected override void NavigateToAccount(GhAccount account)
        {
            var org = account as GhOrganization;

            _navigationService.UriFor <OrgViewModel>()
            .WithParam(vm => vm.OrgJson, JsonConvert.SerializeObject(org))
            .Navigate();
        }