Folder Description The "Controllers" project folder is intended for storing platform-agnostic Controller classes that can change the default XAF application flow and add new features. Relevant Documentation Extend Functionality https://documentation.devexpress.com/eXpressAppFramework/CustomDocument112623.aspx Controller Class https://documentation.devexpress.com/eXpressAppFramework/clsDevExpressExpressAppControllertopic.aspx ViewController Class https://documentation.devexpress.com/eXpressAppFramework/clsDevExpressExpressAppViewControllertopic.aspx WindowController Class https://documentation.devexpress.com/eXpressAppFramework/clsDevExpressExpressAppWindowControllertopic.aspx