void thisBox_Click(object sender, EventArgs e)
        {
            Subject_Info_Form showSubject = new Subject_Info_Form();

            showSubject.SetSubject(subjectObject);
            showSubject.Read_Only = read_only;
            showSubject.ShowDialog();

            if (showSubject.Changed)
            {
                OnDataChanged();
            }

            if (showSubject.Subject_Object != null)
            {
                subjectObject = showSubject.Subject_Object;
            }
            show_subject_info();
        }
        void thisBox_KeyDown(object sender, KeyEventArgs e)
        {
            if ((e.KeyCode != Keys.Control) && (e.KeyCode != Keys.PrintScreen) && (e.KeyCode != Keys.Down))
            {
                Subject_Info_Form showSubject = new Subject_Info_Form();
                showSubject.SetSubject(subjectObject);
                showSubject.Read_Only = read_only;
                showSubject.ShowDialog();

                if (showSubject.Changed)
                {
                    OnDataChanged();
                }

                if (showSubject.Subject_Object != null)
                {
                    subjectObject = showSubject.Subject_Object;
                }
                show_subject_info();
            }
        }