private void toolStripButton2_Click(object sender, EventArgs e)
        {
            frmCadDisciplina frmC_disc = new frmCadDisciplina();

            frmC_disc.MdiParent = this;
            frmC_disc.Show();
        }
        private void disciplinasToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmCadDisciplina frmC_disc = new frmCadDisciplina();

            frmC_disc.MdiParent = this;
            frmC_disc.Show();
        }