I have a requirement to show the validation message for language checkbox if no language not selected . I used below code it shows the alert message box but closes the workflow window . Is there any way to show alert message on top of the Worflow window ?

 class ValidateItem
    {
        public void Process(WorkflowPipelineArgs args)
        {
            Assert.ArgumentNotNull(args, "args");
            if (args.DataItem == null)
                return;
            using (new SecurityDisabler())
            {
                //check if a valid option is selected in the dropdown
                if (args.CommentFields["Select Items"] != null && args.CommentFields["Select Items"].Equals(""))
                {
                    SheerResponse.Alert("Please select a valid option in the 'Select Items' field");
                    args.AbortPipeline();
                    return;
                }

                if (args.CommentFields["Languages"] != null && args.CommentFields["Languages"].Equals(""))
                {
                    SheerResponse.Confirm("Please select at least one language");
                    SheerResponse.SetReturnValue("failed");
                    args.AbortPipeline();
                    return;
                }
                //Don't do validation for child items in case of branch and artilce approval
                foreach (var obj in args.Parameters)
                {
                    var type = obj.GetType();
                    if (type == typeof(Dictionary<string, string>))
                    {
                        var dictionary = (Dictionary<string, string>)obj;
                        string doValidation;
                        dictionary.TryGetValue("DoValidation", out doValidation);
                        if (doValidation == "false") return;
                    }
                }
                //check if item is not already locked by someone other than the current user.
                //ID for list item 'Single Item' in the dropdown
                //added null check for CommentFields in case workflow is executed through SRM
                if (args.CommentFields["Select Items"] != null && !args.CommentFields["Select Items"].Equals(ItemIds.MaginetPublishingWF.ApprovalOption.SingleItemApproval)
                    && args.DataItem.Locking.IsLocked() && args.DataItem.Locking.GetOwner().ToLowerInvariant() != Sitecore.Context.User.DisplayName.ToLowerInvariant())
                {
                    SheerResponse.Alert("Cannot fast approve '" + args.DataItem.DisplayName + "' as it is locked by another user(" + args.DataItem.Locking.GetOwnerWithoutDomain() + ").", new string[0]);
                    args.AbortPipeline();
                    return;
                }

                //Read item presentation details, validation for related data source content item with at least one version in approve state
                if (!args.CommentFields["Select Items"].Equals(ItemIds.MaginetPublishingWF.ApprovalOption.BranchApproval))
                {
                    var renderings = ItemUtils.GetItemRenderings(args.DataItem);
                    bool relatedDSInDraft = true;
                    foreach (var rd in renderings)
                    {
                        Item dataSource = ItemUtils.GetDataSourceItem(rd.Datasource, args.DataItem);
                        if (dataSource != null && dataSource.IsBasedOnTemplate(TemplateIds.PageTemplate))
                        {
                            foreach (var versionItem in dataSource.Versions.GetVersions())
                            {
                                IWorkflow versionItemWorkflow = versionItem.Database.WorkflowProvider.GetWorkflow(versionItem);
                                if (versionItemWorkflow != null)
                                {
                                    WorkflowState parentWorkflowState = versionItemWorkflow.GetState(versionItem);
                                    if (parentWorkflowState.StateID == ItemIds.MaginetPublishingWF.State.ApprovedState)
                                    {
                                        relatedDSInDraft = false;
                                        break;
                                    }
                                }
                                else
                                {
                                    relatedDSInDraft = false;
                                }
                            }
                            if (relatedDSInDraft)
                            {
                                SheerResponse.Alert("Cannot fast approve '" + args.DataItem.DisplayName + "' becasue for '" + dataSource.Paths.FullPath + "' data source item there is no approved item version'", new string[0]);
                                args.AbortPipeline();
                                return;
                            }
                        }
                    }
                }
                if (args.DataItem.Paths.IsContentItem)
                {
                    //validation for parent item
                    Item parentItem = args.DataItem.Parent;
                    if (parentItem != null)
                    {
                        IWorkflow argsWorkflow = args.DataItem.Database.WorkflowProvider.GetWorkflow(args.DataItem);
                        if (argsWorkflow != null)
                        {
                            WorkflowState argsWorkflowState = argsWorkflow.GetState(args.DataItem);

                            while (parentItem.TemplateID != TemplateIds.Site)
                            {
                                IWorkflow parentWorkflow = parentItem.Database.WorkflowProvider.GetWorkflow(parentItem);
                                if (parentWorkflow != null && parentItem.Fields[FieldIDs.DefaultWorkflow].Value == ItemIds.MaginetPublishingWF.WorkflowID)
                                {
                                    WorkflowState parentWorkflowState = parentWorkflow.GetState(parentItem);
                                    if (parentItem.Versions.Count == 1 && parentWorkflowState.StateID == argsWorkflowState.StateID)
                                    {
                                        SheerResponse.Alert("Cannot fast approve '" + args.DataItem.DisplayName + "' as '" + parentItem.DisplayName + "' is not approved", new string[0]);
                                        args.AbortPipeline();
                                        return;
                                    }
                                }
                                parentItem = parentItem.Parent;
                            }
                        }
                    }
                }

            }
        }

    }
}