public static FrmHorarioMensualMant Instance()
        {
            if (frmInstance == null || frmInstance.IsDisposed == true)
            {
                frmInstance = new FrmHorarioMensualMant();
            }

            frmInstance.BringToFront();

            return(frmInstance);
        }
 private void btnNuevo_Click(object sender, EventArgs e)
 {
     try
     {
         var frmHorarioNew = FrmHorarioMensualMant.Instance();
         frmHorarioNew.MdiParent = this.MdiParent;
         frmHorarioNew.Show();
         frmHorarioNew.frmList = this;
     }
     catch (Exception ex)
     {
         Util.ErrorMessage(ex.Message);
     }
 }