private void bBMToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (BBM == null)
            {
                BBM = new Form_BBM();

                BBM.FormClosed += new FormClosedEventHandler(formbbm);
                BBM.Show();
            }
            else
            {
                BBM.Activate();
            }
        }
 void formbbm(Object sender, FormClosedEventArgs e)
 {
     BBM = null;
 }