An object model is provided that allows .NET developers to customize the Office Ribbon user interface according to a .NET Ribbon model rather than the Ribbon XML/callback model of Office applications. The .NET Ribbon model implements the IRibbonExtensibility interface and provides properties and events for Ribbon components. At runtime, the .NET Ribbon model generates and provides an Office application or document with the XML needed to render the custom Ribbon user interface. A visual designer tool uses the .NET Ribbon model to provide .NET developers with a component view architecture that allows developers to set component properties and generate events.