private void barrioToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (formBarrio == null)
     {
         formBarrio             = new Barrio();
         formBarrio.MdiParent   = this;
         formBarrio.FormClosed += new FormClosedEventHandler(CerrarFormaBarrio);
         formBarrio.Show();
         formBarrio.WindowState = FormWindowState.Normal;
     }
     else
     {
         formBarrio.Activate();
     }
 }
 private void CerrarFormaBarrio(object sender, FormClosedEventArgs e)
 {
     formBarrio = null;
 }