private void AddUnitTypeCmd(object obj) { var unitType = obj as QuantityUnitType; if (string.IsNullOrWhiteSpace(unitType.UnitName)) { return; } _repositoryManager.AddUnitType(unitType); UnitTypeToAdd = new QuantityUnitType(); Units = ProcessUnitType(_repositoryManager.GetUnitsOfMaterial()); MaterialToAdd.SelectedUnit = Units.First(); OnPropertyChanged(nameof(MaterialToAdd)); }