Dev2.Studio.UserInterfaceLayoutProvider.EditSwitchCaseExpression C# (CSharp) Method

        internal void EditSwitchCaseExpression(Tuple<ModelProperty, IEnvironmentModel> payload)
        {
            IEnvironmentModel environment = payload.Item2;
            ModelProperty switchCaseValue = payload.Item1;

            string modelData = JsonConvert.SerializeObject(DataListConstants.DefaultCase);


            ErrorResultTO errors = new ErrorResultTO();
            IDataListCompiler compiler = DataListFactory.CreateDataListCompiler(environment.DataListChannel);
            Guid dataListID = GlobalConstants.NullDataListID;

            if (errors.HasErrors()) //BUG 8796, Added this if to handle errors
            {
                // Bad things happened... Tell the user
                PopupProvider.Show(errors.MakeDisplayReady(), GlobalConstants.SwitchWizardErrorHeading,
                                   MessageBoxButton.OK, MessageBoxImage.Error);
                // Stop configuring!!!
                return;
            }

            // Extract existing value ;)

            if (switchCaseValue != null)
            {
                string val = switchCaseValue.ComputedValue.ToString();
                modelData = JsonConvert.SerializeObject(new Dev2Switch() { SwitchVariable = val });
            }
            else
            {
                // Problems, push empty model ;)
                compiler.PushSystemModelToDataList(dataListID, DataListConstants.DefaultCase, out errors);
            }

            // now invoke the wizard ;)
            Uri requestUri;
            if (Uri.TryCreate((environment.WebServerAddress + GlobalConstants.SwitchDragWizardLocation),
                              UriKind.Absolute, out requestUri))
            {
                string uriString = Browser.FormatUrl(requestUri.AbsoluteUri, dataListID);

                //var callBackHandler = new Dev2DecisionCallbackHandler();
                //callBackHandler.Owner = new WebPropertyEditorWindow(callBackHandler, uriString) { Width = 580, Height = 270 };
                //callBackHandler.Owner.ShowDialog();
                _callBackHandler.ModelData = modelData;
                WebSites.ShowWebPageDialog(uriString, _callBackHandler, 470, 285);


                // Wizard finished...
                // Now Fetch from DL and push the model data into the workflow
                try
                {
                    var ds = compiler.FetchSystemModelFromDataList<Dev2Switch>(dataListID, out errors);

                    if (ds != null)
                    {
                        // ReSharper disable PossibleNullReferenceException
                        switchCaseValue.SetValue(ds.SwitchVariable);
                        // ReSharper restore PossibleNullReferenceException
                    }
                }
                catch
                {
                    // Bad things happened... Tell the user
                    PopupProvider.Buttons = MessageBoxButton.OK;
                    PopupProvider.Description = GlobalConstants.SwitchWizardErrorString;
                    PopupProvider.Header = GlobalConstants.SwitchWizardErrorHeading;
                    PopupProvider.ImageType = MessageBoxImage.Error;
                    PopupProvider.Show();
                }
            }
        }