private void toolStripButtonRelance_Click(object sender, EventArgs e)
        {
            EcranRelance monEcran;

            monEcran           = new EcranRelance();
            monEcran.MdiParent = this;
            monEcran.Show();
        }
        private void relancesCTRLRToolStripMenuItem_Click(object sender, EventArgs e)
        {
            EcranRelance monEcran;

            monEcran           = new EcranRelance();
            monEcran.MdiParent = this;
            monEcran.Show();
        }