How to create EnterpriseResource with CustomField

Hi,

I would like to create an EnterpriseResource with CustomField using CSOM in Project Server 2013. I can create EnterpriseResource  by following code

 EnterpriseResourceCreationInformation newRes = new EnterpriseResourceCreationInformation();
                    newRes.ResourceType = EnterpriseResourceType.Work;
                    newRes.Name = item.FullName;
                    newRes.Id = Guid.NewGuid();
                    newRes.IsBudget = false;
                    newRes.IsGeneric = false;
                    newRes.IsInactive = false;

                   EnterpriseResource res = resources.Add(newRes);
                   resources.Update();

                   projContext.ExecuteQuery();

But this EnterPriseResource does not contains list of CustomFields(list of customFields is empty). 

projContext.Load(res.CustomFields);

projContext.ExecuteQuery();

I tried to add some dictionary item in res.FieldValues, but I had no success.

Thanks, Serg Samoilov