private async void SaveBranch(object branchObj)
        {
            BranchesViewModel branchS = branchObj as BranchesViewModel;

            if ((branchS != null) && branchS.isValid())
            {
                bool            postRes = false;
                BranchesService us      = new BranchesService();
                postRes = await us.PostAsync(branchS.branch);//us.PostUserSync(userS.user);

                if (postRes)
                {
                    BranchesList.Add(branchS);
                }
            }
            Back();
        }
        private async void DeleteBranch(object branchObj)
        {
            BranchesViewModel branchD = branchObj as BranchesViewModel;

            if (branchD != null && branchD.isValid())
            {
                bool            delRes = false;
                BranchesService us     = new BranchesService();
                delRes = await us.DeleteAsync(branchD.branch);

                if (delRes)
                {
                    BranchesList.Remove(branchD);
                }
            }
            Back();
        }