/// <summary>
 /// Двойной клик по тренировке => открыть тренировку для просмотра
 /// </summary>
 private void listBoxTrainings_DoubleClick(object sender, EventArgs e)
 {
     if (listBoxTrainings.SelectedIndex > -1)
     {
         var form = new AddTrainingForm();
         form.Training   = trainings[listBoxTrainings.SelectedIndex];
         form.IsReadOnly = true;
         form.Show();
     }
 }
        private void buttonAddTraining_Click(object sender, EventArgs e)
        {
            var form = new AddTrainingForm();

            if (form.ShowDialog() == DialogResult.OK)
            {
                trainings.Insert(0, form.Training);
                listBoxTrainings.Items.Insert(0, form.Training);
            }
        }