public void ShowEditTrainingPeriod(IFormFactory formFactory,
ITrainingPeriodRepository trainingPeriodRepository,
int periodId,
IMainController mainController)
{
IEditTrainingPeriodForm form = formFactory.CreateEditTrainingPeriodForm();
TrainingPeriod trainingPeriod = trainingPeriodRepository.GetTrainingPeriodWithId(periodId);
form.ShowModal(mainController, trainingPeriod);
}