public void btnIR_Click(object sender, EventArgs e)
        {
            if (GetIRRADIANCE == null)
            {
                GetIRRADIANCE             = new IRRADIANCE();
                GetIRRADIANCE.FormClosed += new FormClosedEventHandler(GetIRRADIANCE_FormClosed);
                GetIRRADIANCE.Show();
            }
            else
            {
                GetIRRADIANCE.Activate();
                switch (cmbBoxLanguage.SelectedIndex)
                {
                case 0:
                    MessageBox.Show("The 'IRRADIANCE TEST' window is already open!");
                    break;

                case 1:
                    MessageBox.Show("A janela 'TESTE DE IRRADIÂNCIA' já está aberta!");
                    break;
                }
            }
        }
 private void GetIRRADIANCE_FormClosed(object sender, FormClosedEventArgs e)
 {
     GetIRRADIANCE = null;
 }