agent-skills

Build .NET applications with the DevExpress Spreadsheet Document API for creating, reading, modifying, and exporting Excel workbooks programmatically without Microsoft Office. Use when working with .xlsx, .xls, .xlsm, .csv spreadsheet files, cell formatting, formulas, charts, pivot tables, data import/export, or workbook printing. Also use when someone mentions "DevExpress Spreadsheet", "Spreadsheet Document API", "IWorkbook", "Worksheet", "DevExpress.Spreadsheet", "create Excel file in C#", "read xlsx in .NET", "spreadsheet export to PDF", "cell formatting", or asks about any Excel/spreadsheet automation with DevExpress. Covers both .NET and .NET Framework.

Expert skill for the DevExpress WinForms AccordionControl (DevExpress.XtraBars.Navigation.AccordionControl, DevExpress.Win.Navigation NuGet). Covers creating and populating accordion menus, data-driven element generation from collections, AccordionControlElement groups and items, content containers with embedded controls, header layout customization via HeaderTemplate, view types (Default accordion vs HamburgerMenu), Hamburger Menu display modes (Inline/Overlay/Minimal), minimize/expand state, Footer root-element mode, built-in and external search/filter panel, AI Smart Search, expand/collapse behavior, animations, appearance and HTML-CSS templates, context buttons, custom drawing, and guidance on choosing between AccordionControl, NavBarControl, and Hamburger Menu style. Use this skill when a user asks about WinForms side navigation, accordion menus, hamburger menus, collapsible navigation bars, AccordionControlElement configuration, NavigationFrame integration, or FluentDesignForm navigation setup.

AI agent skill for the DevExpress WinForms AIChatControl. Covers NuGet setup, the project SDK change, AI client registration (OpenAI, Azure OpenAI, Ollama), adding the control to a form, streaming, Markdown rendering, manual message handling (MessageSending), and chat history (SaveMessages/LoadMessages). Use for any DevExpress WinForms AIChatControl scenario.

DevExpress WinForms Chart Control (DevExpress.XtraCharts.ChartControl) for 2D and 3D data visualization. Covers the element hierarchy (ChartControl, Diagram, Series, SeriesView); data binding (DataSource, SeriesDataMember, ArgumentDataMember, ValueDataMembers, SeriesTemplate, FinancialDataMembers, RefreshData); the series-view catalog and parent diagrams (XYDiagram hosts Bar/Line/Area/Point/Bubble/Financial/BoxPlot; SimpleDiagram hosts Pie/Doughnut/Funnel; Radar, Polar, Gantt, SwiftPlot, 3D); axes (AxisX/AxisY, SecondaryAxes, scale types Numerical/DateTime/Qualitative, ranges, aggregation); titles and labels (TextPattern, CustomAxisLabel); legends (Legend/Legends, alignment, markers); tooltips vs the crosshair cursor (ToolTipController, CrosshairOptions); and selection (SelectionMode, SeriesSelectionMode, ObjectSelected). Use for any WinForms charting scenario including financial/stock charts and real-time updates.

DevExpress WinForms Data Grid — GridControl with GridView, BandedGridView, AdvBandedGridView, CardView, LayoutView, TileView, and WinExplorerView, plus the TreeList for hierarchical data. Covers data binding (regular, ServerMode, InstantFeedback, VirtualServerModeSource), column generation (PopulateColumns, AddVisible, unbound columns via UnboundExpression, bands, ColumnEdit), cell display and editing (RepositoryItem, CustomRowCellEdit, DisplayFormat, edit forms, OptionsColumn), conditional formatting (FormatRules), validation (ValidateRow, SetColumnError), filtering (Excel-style, Auto Filter Row, Find Panel, ActiveFilterString), sorting and grouping (SortInfo, GroupInterval), master-detail (LevelTree, pattern views), print and export (ExportToXlsx/Pdf), focus and selection (FocusedRow, MultiSelect), drag-and-drop, and layout persistence (SaveLayoutToXml). Use for any WinForms grid, tree-list, or card-view scenario.

DevExpress WinForms Editors suite — every editor under DevExpress.XtraEditors: the BaseEdit hierarchy (TextEdit, ButtonEdit, MemoEdit, ComboBoxEdit, ImageComboBoxEdit, CheckedComboBoxEdit, LookUpEdit, GridLookUpEdit, SearchLookUpEdit, TreeListLookUpEdit, SpinEdit, DateEdit, TimeEdit, TimeSpanEdit, CalcEdit, ColorEdit, ColorPickEdit, CheckEdit, ToggleSwitch, PictureEdit, ProgressBarControl, RadioGroup, RatingControl, TokenEdit, TrackBarControl) plus non-BaseEdit controls (LabelControl, SimpleButton, DropDownButton, ListBoxControl, CheckedListBoxControl). Covers EditValue binding, the RepositoryItem and live-editor pattern, input masks (DateTime, Numeric, RegEx, Simple, TimeSpan, MaskSettings.Configure, EditMask attributes, UseMaskAsDisplayFormat), and editor buttons (EditorButton, ButtonPredefines, Properties.Buttons, ButtonClick, SVG/raster glyphs, TextEditStyle). Use for any standalone WinForms editor, value formatting, mask validation, or ButtonEdit customization.

DevExpress WinForms Layout Management — form layout and docking controls: LayoutControl (free/flow/table layout modes, groups, tabbed groups, size constraints, runtime customization), DataLayoutControl (data-source-driven auto-generated editor layout, RetrieveFields, DataAnnotations), DockManager with DockPanel (VS-style docking, floating panels, auto-hide, tab groups, DockingStyle, DockAsTab), StackPanel, and TablePanel (Absolute/AutoSize/Relative sizing, RowSpan/ColumnSpan). Covers NuGet (DevExpress.Win.Navigation, DevExpress.Utils), namespaces (DevExpress.XtraLayout, DevExpress.XtraDataLayout, DevExpress.XtraBars.Docking, DevExpress.Utils.Layout), authoring layouts in the *.Designer.cs file (InitializeComponent), building layouts in code (AddItem, AddGroup, AddTabbedGroup), and saving/restoring layouts (SaveLayoutToXml/Json, WorkspaceManager). Use for any WinForms layout, form arrangement, or docking scenario; for a form generated from a table/class use DataLayoutControl.

DevExpress WinForms Loading Indicators — SplashScreenManager (namespace DevExpress.XtraSplashScreen) is the single entry point. Covers four types: (1) Splash Screen for app startup — Fluent (ShowFluentSplashScreen with FluentSplashScreenOptions, FluentLoadingIndicatorType Dots/Ring/Spinner), Skin, Default, and Splash Image, shown before Application.Run() and closed via CloseForm(); (2) Wait Form — a modal full-form overlay for long operations (ShowWaitForm, SetWaitFormCaption/Description, SendCommand, CloseWaitForm); (3) Overlay Form — a semi-transparent overlay over a control (ShowOverlayForm returning IOverlaySplashScreenHandle, CloseOverlayForm in try/finally, custom painting); (4) ProgressPanel — an inline control with Caption, Description, WaitAnimationType Ring/Line/Bar. NuGet DevExpress.Win.Navigation; host on XtraForm/RibbonForm. Use for splash screens, wait indicators, busy overlays, and progress panels.

DevExpress WinForms MVVM Framework with the MVVMContext component. Covers ViewModel types and priority order (compile-time DevExpress.Mvvm.CodeGenerators with [GenerateViewModel]/[GenerateProperty]/[GenerateCommand] preferred; runtime POCO with public virtual properties for legacy projects; ViewModelBase with SetProperty/DelegateCommand/AsyncCommand; CommunityToolkit.Mvvm as an alternative), property bindings (RaisePropertyChanged, INPC), DelegateCommand and AsyncCommand with CanExecute, the Fluent API (SetBinding, BindCommand, BindCancelCommand, WithEvent, EventToCommand), DevExpress services (IMessageBoxService, IDialogService, IDocumentManagerService, INavigationService, IDispatcherService, ISplashScreenService, file-dialog services), behaviors (ConfirmationBehavior, EventToCommandBehavior), and ViewModel communication (Messenger, parent-child chains, ISupportParameter). Use for any DevExpress WinForms MVVM scenario — MVVMContext, ViewModels, bindings, commands, services, behaviors.

AI agent skill for the DevExpress WinForms PivotGridControl. Covers NuGet setup, data binding (DataSourceColumnBinding, ExpressionDataBinding, OLAP), field areas and layout, summaries, grouping, sorting, filtering, conditional formatting (FormatRules), and appearance customization. Use for any DevExpress WinForms PivotGridControl cross-tabular analysis scenario.

DevExpress WinForms PropertyGridControl — displays and edits the public properties of any object. Covers NuGet setup (DevExpress.Win.VerticalGrid, namespace DevExpress.XtraVerticalGrid), assigning objects via SelectedObject and SelectedObjects, Classic vs Office view (ActiveViewType), automatic row generation from reflection, manual rows (EditorRow, CategoryRow, MultiEditorRow), configuring rows (FieldName, Caption, RowEdit, Format, Visible, ReadOnly), DefaultEditors type-to-editor mapping, CustomPropertyDescriptors and CustomRowCreated events, category rows from CategoryAttribute, nested row hierarchy, Office-view tabs via TabPanelCustomize, expanding nested objects via ExpandableObjectConverter, collection editing via OptionsCollectionEditor (UseDXCollectionEditor), EditorAttribute overrides, PropertyDescriptionControl, and the search/find panel (FindPanelVisible, OptionsFind). Use for any WinForms settings panel, inspector window, or configuration editor built on PropertyGridControl.

DevExpress WinForms Ribbon (RibbonControl) and traditional Bars (BarManager + Bar) — Office-style ribbon UIs or classic main-menu/toolbar/status-bar UIs. Covers the RibbonForm host requirement, the items/links architecture (BarItem and BarItemLink: BarButtonItem, BarCheckItem, BarToggleSwitchItem, BarSubItem, BarEditItem, BarStaticItem, BarLargeButtonItem, RibbonGalleryBarItem), item properties (Caption, ImageOptions.SvgImage, RibbonStyle, ButtonStyle, GroupIndex, ItemShortcut), per-link overrides (UserCaption, BeginGroup, MostRecentlyUsed), appearance (RibbonControl.RibbonStyle Office2007 through OfficeUniversal, SkinManager), MDI ribbon and bars merging (MdiMergeStyle, MergeRibbon, Bar.Merge, MergeType/MergeOrder), bar layout (DockStyle, DockRow, MainMenu, StatusBar), and ribbon structure (RibbonPageCategory, RibbonPage, RibbonPageGroup, Toolbar/QAT, ApplicationMenu or BackstageViewControl, galleries). Use for any WinForms ribbon or bars/toolbar/menu scenario.

DevExpress WinForms Scheduler (SchedulerControl with SchedulerDataStorage; Day/WorkWeek/FullWeek/Month/Year/Timeline/Agenda/Gantt views; appointments, resources, recurrence, reminders, labels, statuses). Covers getting started (NuGet, RibbonForm, DateNavigator, Start), data binding (bound mode with appointment/resource field mappings, custom mappings, unbound code mode, resource grouping, RefreshData), data items (Appointment types Normal/Pattern/Occurrence/Exception, recurrence Daily/Weekly/Monthly/Yearly, RecurrenceInfo, reminders, labels, statuses, custom fields), views (SchedulerViewType, DayView TimeScale/WorkTime, MonthView CompressWeekend, TimelineView scales, ActiveViewType, grouping by resource/date), and appearance customization (AppointmentViewInfoCustomizing, CustomDrawAppointment, InitAppointmentDisplayText). Use for any SchedulerControl scenario — calendar scheduling, resource booking, project timelines, appointment management.

Expert skill for the DevExpress WinForms XtraTabControl (DevExpress.XtraTab, DevExpress.Win.Navigation NuGet). Build tabbed UIs that organize controls into pages — add/remove XtraTabPage pages via the TabPages collection or designer, populate pages, position and orient headers (HeaderLocation, HeaderOrientation), wrap headers into rows (MultiLine), show Prev/Next/Close header buttons (HeaderButtons) and per-page Close buttons (ClosePageButtonShowMode), respond to selection (SelectedPageChanged/SelectedPageChanging) and close (CloseButtonClick) events, hide headers for wizard-style navigation (ShowTabHeader), add header icons (XtraTabPage.ImageOptions), and add custom header buttons (CustomHeaderButtons). Use when a user asks about WinForms tab control, tabbed pages, XtraTabControl, XtraTabPage, tab headers, closable tabs, tab navigation, or organizing controls into pages on a form. For MDI/document interfaces use DocumentManager or XtraTabbedMdiManager instead.

Expert skill for the DevExpress WinForms TreeList control (DevExpress.XtraTreeList.TreeList, DevExpress.Win.TreeList NuGet) — a data-aware control that shows data as a tree, a multi-column tree-grid, or both. Use when binding self-referential data (KeyFieldName, ParentFieldName, RootValue), building unbound trees in code (AppendNode, BeginUnboundLoad/EndUnboundLoad), dynamic on-demand loading (TreeListNode.HasChildren + BeforeExpand), defining TreeListColumn and unbound columns (UnboundExpression), in-place editors (ColumnEdit, RepositoryItems), sorting, filtering (ActiveFilterString, Find Panel), summaries, conditional formatting (FormatRules), node operations (FocusedNode, FindNodeByKeyID/FieldValue, Expand/Collapse, checkboxes, images), drag-and-drop, printing, and export. Use when a user asks about WinForms tree, TreeList, XtraTreeList, hierarchical grid, tree-grid, org charts, file/folder trees, parent-child data, TreeListNode, or multi-column tree view. For flat tabular data use the Data Grid instead.

Build .NET applications with the DevExpress AI-Powered Extensions for Office File API to add NLP-powered document processing capabilities — proofreading, translation, and text transformation for Word documents, PDF files, and PowerPoint presentations. Use when integrating AI language models (Azure OpenAI, OpenAI, Ollama, Google Gemini) with document processing workflows, translating documents programmatically, or proofreading documents with AI. Also use when someone mentions "DevExpress AI", "AIIntegration.Docs", "AIDocProcessingService", "proofread Word document", "translate PDF", "AI document processing .NET", or asks about AI-powered document automation with DevExpress. Requires DevExpress v25.2+.

Create, load, modify, secure, and print PDF documents using the new DevExpress.Docs.Pdf API — a modern object-oriented DOM approach for .NET. Use when building .NET applications that need to programmatically generate or edit PDF files using the new DevExpress PDF Document API (CTP). Also use when someone mentions "DevExpress.Docs.Pdf", "new PDF API", "PdfDocument class", "pdf fragment", "pdf pages collection", "pdf form fields", "pdf redaction", "pdf structure tree", "tagged pdf", "pdf/ua", "pdf encryption", "pdf annotations new API", or asks to migrate from PdfDocumentProcessor to the new API. Covers both .NET and .NET Framework.

Build .NET applications with the DevExpress Presentation API for creating, reading, modifying, and exporting PowerPoint presentations programmatically without Microsoft Office. Use when working with .pptx files, slides, shapes, text, tables, slide masters and layouts, themes, slide backgrounds, notes, headers/footers, or exporting presentations to PDF. Also use when someone mentions "DevExpress Presentation", "Presentation API", "DevExpress.Docs.Presentation", "create PowerPoint in C#", "pptx automation .NET", "merge presentations", or asks about any PowerPoint/presentation processing with DevExpress. Covers .NET.

Build .NET applications with the DevExpress Unit Conversion API for converting between metric and US units of measurement with type-safe fluent syntax. Use when converting distances, lengths, weights, temperatures, areas, volumes, speeds, or metric prefixes in .NET applications. Also use when someone mentions "DevExpress Unit Conversion", "UnitConversion", "DevExpress.UnitConversion", "convert units C#", "metric to imperial", "length conversion .NET", or asks about any unit conversion with DevExpress. Covers both .NET and .NET Framework.

Build .NET applications with the DevExpress Word Processing Document API for creating, reading, modifying, and exporting Word documents programmatically without Microsoft Office. Use when working with .docx, .doc, .rtf, .odt, .txt documents, paragraphs, tables, styles, mail merge, headers/footers, fields, track changes, or document conversion. Also use when someone mentions "DevExpress Word", "Word Processing Document API", "RichEditDocumentServer", "DevExpress.XtraRichEdit", "create Word document in C#", "docx automation", "mail merge .NET", or asks about any Word/document processing with DevExpress. Covers both .NET and .NET Framework.

Create reports programmatically with DevExpress XtraReports runtime API (.NET and .NET Framework). Build XtraReport in code, add bands (DetailBand, GroupHeaderBand), controls (XRLabel, XRTable, XRChart), parameters, expressions. Bind to data sources, calculated fields, group reports. Export to PDF, Excel, Word, CSV, HTML, Images with ExportOptions. Master-detail, subreports, cross-tabs. Works cross-platform WinForms, WPF, ASP.NET Core, Blazor.

Expert skill for creating and modifying DevExpress XtraReport layout code in Visual Studio and JetBrains Rider — writing and editing *.Designer.cs files, InitializeComponent structure, bands, controls, expression bindings, styles, parameters, and data source wiring. Use this skill whenever someone asks to create a DevExpress report, add controls to a report, modify a *.Designer.cs file, fix designer-generated code, work with XRTable/XRLabel/XRPictureBox/bands, set up data binding expressions, define report parameters, or troubleshoot why a report won't open in the Visual Studio or JetBrains Rider designer. Also use when someone asks about XtraReports InitializeComponent patterns, report band hierarchy, Criteria Language expressions, summary functions, or JetBrains Rider report designer limitations.

Generate and configure DevExpress Blazor AI Chat (DxAIChat) — an AI-powered chat UI for Blazor apps. Use for building conversational assistants, integrating providers (OpenAI, Azure OpenAI, Ollama, or custom), configuring system prompts and suggestions, streaming responses, attachments, Markdown rendering, and tool/function calling via custom IChatResponseProvider implementations. Also use for DxAIChat, AI chat component, LLM chat UI, OpenAI setup, and chat architecture comparisons or migration scenarios.

Generate and configure DevExpress Blazor Charts (DxChart, DxPieChart, DxPolarChart) for common chart types (line/bar/area/pie/donut/scatter/bubble/financial), data binding, axes, series, labels, tooltips, legends, annotations, zoom/pan, palettes, selection, and export/print. Also use for Blazor charts, data visualization, dashboards, and chart feature comparisons or migration scenarios.

Build and configure the DevExpress Blazor ComboBox (DxComboBox) — a drop-down/select editor for Blazor Server, WebAssembly, and Hybrid apps. Use for data binding (sync/async), searching/filtering, grouping, virtualization, multi-column item lists, templates (item/edit box), validation in EditForm, Clear button and custom buttons, and cascading combo boxes. Also use for DxComboBox, combo box, dropdown, select, item picker, AllowUserInput, SearchMode, and editor feature comparisons or migration scenarios.

Generate and configure DevExpress Blazor visualization components such as DxBarGauge, DxRangeSelector, DxSankey, DxSparkline, and DxMap. Use when building dashboards with gauges and range selection, Sankey flow diagrams, sparklines/mini charts, and interactive maps (data binding, labels, palettes, selection/hover/click events). Also use for bar gauge, range selector, Sankey, sparkline, map, and visualization feature comparisons or migration scenarios.

Build and configure the DevExpress Blazor Grid (DxGrid) — a full-featured data grid for Blazor Server, WebAssembly, and Hybrid apps. Use when binding tabular data (IEnumerable/IQueryable/EF Core/server-mode/custom sources), enabling sorting/filtering/grouping/search, implementing CRUD editing (row/edit form/popup/cell), handling selection and focused rows, exporting to CSV/XLSX/PDF, customizing templates and summaries, and supporting large datasets with virtualization. Also use for DxGrid, DevExpress grid, Blazor data grid, virtual scrolling, server mode, and grid feature comparisons or migration scenarios.

Build and configure the DevExpress Blazor Pivot Table (DxPivotTable) — an interactive pivot grid / cross-tab analysis component for Blazor. Use for pivot-style row/column aggregation (sum/count/avg/min/max), field layout (area/area index), date grouping (year/quarter/month), interactive filtering, and building analytical dashboards. Also use for DxPivotTable, pivot grid, pivot table, cross-tab, OLAP-style analysis, and pivot feature comparisons or migration scenarios.

Build and configure the DevExpress Blazor Ribbon (DxRibbon) — an Office-style tabbed command UI for Blazor. Use when creating ribbon tabs, groups, and items; application menu (File); contextual tabs; toggle/check items and radio groups; and embedding editors like combo boxes, spin edits, and color palettes. Also use for DxRibbon, ribbon UI, Office ribbon, command bar, and ribbon feature comparisons or migration scenarios.

Build and configure the DevExpress Blazor Scheduler (DxScheduler) — a calendar/appointment scheduling component for Blazor Server, WebAssembly, and Hybrid apps. Use for day/week/work-week/month/timeline views; data binding via DxSchedulerDataStorage and AppointmentMappings; appointment creation, editing, deletion, drag-and-drop and resize; recurring appointments (RecurrenceInfo / recurrence rules); resources (rooms/people); labels/statuses; and time/work-time configuration. Also use for DxScheduler, scheduler, calendar, appointment calendar, recurring appointments, and scheduling feature comparisons or migration scenarios.

Build and configure the DevExpress Blazor Toolbar (DxToolbar) — an adaptive command bar for Blazor apps. Use when adding toolbars/command bars, configuring DxToolbarItem buttons, drop-down menus, overflow/adaptivity, icons/tooltips/links, checked and radio-group items, data binding, item templates (ChildContent/Template), and triggering actions like form submission. Also use for DxToolbar, DxToolbarItem, adaptive toolbar, overflow menu, command bar, and toolbar feature comparisons or migration scenarios.

Build and configure the DevExpress Blazor TreeList (DxTreeList) — a hierarchical data grid / tree grid for Blazor Server, WebAssembly, and Hybrid apps. Use when displaying tree-structured or parent-child data; binding flat data with KeyFieldName, ParentKeyFieldName, and RootValue; expanding/collapsing nodes; sorting, filtering, search box, and filter panel; implementing CRUD editing for tree nodes; exporting to CSV/XLSX/PDF; loading child nodes on demand; and reordering/re-parenting nodes with drag-and-drop. Also use for DxTreeList, DevExpress TreeList, tree grid, hierarchical grid, parent-child table, and tree grid feature comparisons or migration scenarios.

Integrate DevExpress Report Viewer and Report Designer into ASP.NET Core MVC and Razor Pages. Configure Program.cs with AddDevExpressControls, ConfigureReportingServices. Set up npm bundling (bundleconfig.json, libman.json). Implement ReportStorageWebExtension, IReportProvider. Customize viewer toolbar, tab panel, export options, parameter editors. Security: authorization, CSRF, Content Security Policy. Report caching with UseCachedReportSourceBuilder. Deploy to Linux/macOS with Skia. Troubleshoot blank viewer, 400/404/500 errors, "Unable to process binding", "Report not found", CORS, version mismatches. Use when: add document viewer, end-user report designer, ASP.NET Core reporting, web farm document storage, upgrade DevExpress reporting packages.

Integrate DevExpress Report Viewer and Report Designer into Blazor Server, Blazor WebAssembly, and Blazor Web App. Register AddDevExpressServerSideBlazorReportViewer, AddDevExpressBlazorReporting in Program.cs. Configure DxResourceManager.RegisterScripts in App.razor. Components: DxReportViewer, DxDocumentViewer, DxReportDesigner, DxWasmDocumentViewer, DxWasmReportDesigner. Load reports via OpenReportAsync, ReportName. Customize toolbar, tab panel, parameter editors. Implement IReportProvider, ReportStorageWebExtension. Troubleshoot blank viewer, "Service not registered", missing render mode, Skia DllNotFoundException. Choose between native, JS-based, and WASM component families.

Build WPF applications with the DevExpress Chart Control (ChartControl) — 2D bar, line, area, pie, financial, polar, radar, funnel, box plot, point, bubble, and scatter series. Use when adding ChartControl to a WPF project; building XYDiagram2D, SimpleDiagram2D (pie/funnel), PolarDiagram2D, or RadarDiagram2D; binding series via DataSource + ArgumentDataMember/ValueDataMember or Diagram.SeriesItemsSource; configuring axes and scale types (Numerical, DateTime, TimeSpan, Qualitative); aggregating data; styling Legend; configuring tooltips and the Crosshair Cursor; or enabling selection. Also use when someone mentions "DevExpress WPF chart", "dxc:ChartControl", "DevExpress.Xpf.Charts", "AreaSeries2D", "LineSeries2D", "BarSideBySideSeries2D", "StockSeries2D", "PieSeries2D", "AxisX2D", "AxisY2D", or "SeriesItemsSource".

Build WPF applications with the DevExpress MVVM Framework — view-model strategies (compile-time GenerateViewModel source generator, runtime POCO ViewModelSource, ViewModelBase, BindableBase), DelegateCommand/AsyncCommand, predefined services (IMessageBoxService, IDialogService, IDocumentManagerService, INotificationService, INavigationService, IDispatcherService), behaviors (EventToCommand, KeyToCommand, FocusBehavior, ConfirmationBehavior), and view-model communication (ISupportParameter, ISupportParentViewModel, Messenger). Use when choosing a view-model strategy (recommend compile-time GenerateViewModel for new projects); wiring commands via [GenerateCommand]/[Command]; calling services via GetService<T>(); adding behaviors via dxmvvm:Interaction.Behaviors; or passing data between view models. Also use when someone mentions "ViewModelSource", "DXMessageBoxService", "DialogService", "EventToCommand", "Messenger.Default", "DevExpress.Mvvm", or "dxmvvm:".

XAF editors covering Property Editors, List Editors, and View Items; data-type-to-editor mappings; accessing and customizing editor controls with CustomizeViewItemControl and OnViewControlsCreated; and implementing custom Property Editors, List Editors, and View Items for Blazor and WinForms.

XAF performance optimization across database, ORM, and application layers. Covers server-mode data sources and data access modes, EF Core eager loading, query splitting, and change-tracking proxies, XPO delayed and explicit loading, PersistentAlias for calculated properties, N+1 Select Problem, database indexing and connection pooling, startup optimization, SQL and .NET profiling, Blazor tab management, and database views.

XAF Security System covering authentication (password, Windows, OAuth2), user and role setup for EF Core and XPO, authorization and Permission Policy, type/object/member/navigation permissions, current-user and role checks, security APIs including ApplicationUser, ISecurityUserWithRoles, ISecurityProvider, and IsGrantedExtensions, predefined users and roles, owner-based access patterns, Audit Trail, and security tiers (Integrated, Middle Tier, UI-level caveat).

Help developers use the DevExtreme Button component (dxButton) in Angular, React, Vue, and jQuery. Use when someone asks about Button configuration, click handling, icons, styling, button types, form submission, validation, custom templates, or any scenario involving dxButton or DxButton. Trigger phrases: "DevExtreme Button", "dxButton", "DxButton", "how do I handle button click", "button icon", "button type", "button styling", "submit form with button", "custom button template".