What problem does it solve? Building a Microsoft Office-style command surface in WPF requires coordinating many DevExpress controls (RibbonControl, BarManager, bar items, item links) with non-obvious rules like the mandatory ThemedWindow conversion and the item-versus-link distinction. This Skill provides the structure, patterns, and troubleshooting guidance to implement Ribbon and bars UIs correctly the first time. ## Core Features & Use Cases - Ribbon Construction: Build the full Ribbon hierarchy (RibbonPageCategory, RibbonPage, RibbonPageGroup, bar items) with Quick Access Toolbar, Application Menu or BackstageView, and Ribbon Status Bar. - Classic Bars Layouts: Create toolbar, main menu, and status bar UIs using standalone MainMenuControl, ToolBarControl, and StatusBarControl, or the legacy BarManager for shared-item scenarios. - MVVM and MDI Merging: Generate bar items from ViewModel collections via ItemsSource/ItemLinksSource templates, and merge child window bars or ribbons into the parent in MDI layouts with MergeType and MergeOrder control. - Use Case: Convert a plain WPF Window to a ThemedWindow, add an Office2019-style Ribbon with Home and View pages wired to ViewModel commands, plus a status bar showing bound application state. ## Quick Start Ask the AI to add a DevExpress RibbonControl with a Home page, clipboard group, and Quick Access Toolbar to your WPF ThemedWindow wired to MVVM commands.