public void OkDialog()
        {
            var helper = new MessageBoxHelper(this);
            var isotopeModification = _driverIsotopeModification.SelectedItem;

            if (isotopeModification == null)
            {
                helper.ShowTextBoxError(comboIsotopeModification, Resources.MessageBoxHelper_ValidateNameTextBox__0__cannot_be_empty);
                return;
            }
            lock (SkylineWindow.GetDocumentChangeLock())
            {
                var originalDocument       = SkylineWindow.Document;
                var deferSettingsChangeDoc = originalDocument.BeginDeferSettingsChanges();
                var globalStaticMods       = Settings.Default.StaticModList.ToList();
                var globalIsotopeMods      = Settings.Default.HeavyModList.ToList();
                var newDocument            = deferSettingsChangeDoc;
                var simplePermutation      = SimplePermutation;
                using (var longWaitDlg = new LongWaitDlg()
                {
                    Text = Resources.PermuteIsotopeModificationsDlg_OkDialog_Permuting_Isotope_Modifications
                })
                {
                    longWaitDlg.PerformWork(this, 1000, progressMonitor =>
                    {
                        var isotopePermuter = new IsotopeModificationPermuter(isotopeModification,
                                                                              simplePermutation, IsotopeLabelType.heavy, globalStaticMods, globalIsotopeMods);
                        newDocument = isotopePermuter.PermuteIsotopeModifications(progressMonitor, newDocument);
                        if (!ReferenceEquals(newDocument, deferSettingsChangeDoc))
                        {
                            var settingsChangeMonitor = new SrmSettingsChangeMonitor(progressMonitor, Resources.PermuteIsotopeModificationsDlg_OkDialog_Updating_settings);
                            newDocument = newDocument.EndDeferSettingsChanges(originalDocument, settingsChangeMonitor);
                        }
                    });
                    if (longWaitDlg.IsCanceled)
                    {
                        return;
                    }
                }
                if (!ReferenceEquals(newDocument, deferSettingsChangeDoc))
                {
                    SkylineWindow.ModifyDocument(Resources.PermuteIsotopeModificationsDlg_OkDialog_Permute_isotope_modifications, doc =>
                    {
                        // This will be true because we have acquired the lock on SkylineWindow.DocumentChangeLock()
                        Assume.IsTrue(ReferenceEquals(doc, originalDocument));
                        return(newDocument);
                    }, docPair => GetAuditLogEntry(docPair, isotopeModification, simplePermutation));
                }
                DialogResult = DialogResult.OK;
            }
        }