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