private void FillPurchaseOrderLineTab()
{
vendorList.ItemsSource = Vendors.ToDictionary(x => x.AdministrationCode, y => $"{y.AdministrationCode} - {y.Name}");
vendorList.DisplayMemberPath = "Value";
vendorList.SelectedValuePath = "Key";
var fVendorSelected = Vendors.First(x => x.AdministrationCode == PO.VendorCode);
vendorList.SelectedIndex = Vendors.IndexOf(fVendorSelected);
//PODescription.SetBinding(PO, "Description");
GLAccountList.ItemsSource = GLAccounts.ToDictionary(x => x.AdministrationCode, y => $"{y.AdministrationCode} - {y.Name}");
ArticleList.ItemsSource = Articles.ToDictionary(x => x.AdministrationCode, y => $"{y.AdministrationCode} - {y.Name}");
WarehouseList.ItemsSource = Warehouses.ToDictionary(x => x.AdministrationCode, y => $"{y.AdministrationCode} - {y.Name}");
VatCodeList.ItemsSource = VatCodes.ToDictionary(x => x.AdministrationCode, y => $"{y.AdministrationCode} - {y.Name}");
CostCenterList.ItemsSource = CostCenters.ToDictionary(x => x.AdministrationCode, y => $"{y.AdministrationCode} - {y.Name}");
CostUnitList.ItemsSource = CostUnits.ToDictionary(x => x.AdministrationCode, y => $"{y.AdministrationCode} - {y.Name}");
ProjectList.ItemsSource = Projects.ToDictionary(x => x.AdministrationCode, y => $"{y.AdministrationCode} - {y.Name}");
purchaseOrderLineGrid.ItemsSource = PO.OrderLines;
purchaseOrderLineGrid.CanUserAddRows = true;
}