bazar.Accrual.OnTreeviewServicesCursorChanged C# (CSharp) Method

        protected void OnTreeviewServicesCursorChanged(object sender, EventArgs e)
        {
            TreeIter iter;
            bool isSelect = treeviewServices.Selection.CountSelectedRows() == 1;
            bool MeterOk = false;
            if (isSelect && treeviewServices.Selection.GetSelected (out iter))
                MeterOk = servicesWithMeters.Contains((int)ServiceListStore.GetValue(iter, (int)ServiceCol.service_id));
            buttonDelService.Sensitive = isSelect;
            buttonFromMeter.Sensitive = MeterOk;
        }