private void Btn_Accept(object sender, RoutedEventArgs e)
{
_editedCar.Manufacturer = textBoxManufacturer.Text;
_editedCar.Model = textBoxModel.Text;
_editedCar.Year = int.Parse(textBoxYear.Text);
_editedCar.Fault = textBoxFault.Text;
_editedCar.ArrivalDate = (DateTime)ArrivalDatePicker.SelectedDate;
_editedCar.DepartureDate = (DateTime)DepartureDatePicker.SelectedDate;
_editedCar.OwnerId = comboBoxOwner.SelectedIndex;
_editedCar.ServiceID = comboBoxService.SelectedIndex;
_editedCar.EmployeeID = comboBoxEmployee.SelectedIndex;
_editedCar.ServiceTitle = ServiceRepository.GetClientById(_editedCar.ServiceID).Title;
CarRepository.ChangeElement(_editedIndex, _editedCar);
//CarsView.Ref
this.Close();
}