private void importRubriqueToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (imprub == null || imprub.IsDisposed)
     {
         imprub           = new Import_Rubrique();
         imprub.MdiParent = this;
         imprub.Show();
     }
     else
     {
         imprub.WindowState = FormWindowState.Maximized;
         imprub.Activate();
     }
 }
 private void importRubriqueToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (imprub == null || imprub.IsDisposed)
     {
         imprub = new Import_Rubrique();
         imprub.MdiParent = this;
         imprub.Show();
     }
     else
     {
         imprub.WindowState = FormWindowState.Maximized;
         imprub.Activate();
     }
 }