private void buttonAddNew_Click(object sender, EventArgs e)
        {
            CreateNewExercise form = new CreateNewExercise();

            form.FormClosing += new FormClosingEventHandler(ChildFormClosing);
            form.Show();
        }
        private void buttonAddNewExercise_Click(object sender, EventArgs e)
        {
            CreateNewExercise form = new CreateNewExercise();

            form.Show();
        }