private void GetCarModels(int RefCarMakeId)
 {
     CarModelList = CarModels.GetByRefCarMakeId(RefCarMakeId).ToSvenTechCollection();
     CarBodyList.Clear();
     CarGenerationList.Clear();
     CarTrimList.Clear();
     Years.Clear();
     CarEngine = null;
 }
 private void GetCarMakes()
 {
     CarMakeList = CarMakes.GetAll().ToSvenTechCollection();
     CarModelList.Clear();
     CarBodyList.Clear();
     CarGenerationList.Clear();
     CarTrimList.Clear();
     CarEngine = null;
 }
        private void GetCarBodies(int RefCarModelId)
        {
            CarBodyList = CarBodies.GetByRefCarModelId(RefCarModelId).ToSvenTechCollection();
            CarGenerationList.Clear();
            CarTrimList.Clear();
            Years.Clear();
            CarEngine = null;

            if (CarBodyList?.Count == 1)
            {
                SelectedCarBody = CarBodyList.First();
            }
        }