Any widget can be added to the Items collection of a ribbon group, but only those widgets that implement the INRibbonWidget interface take part in the ribbon layout algorithm and can be collapsed/expanded to smaller/larger states by the ribbon layout engine. Nevron Open Vision provides the following widgets that are commonly used in ribbon UI:

• Ribbon Buttons
• Ribbon Split Buttons
• Ribbon Menu Drop Downs
• Ribbon Galleries
• Ribbon Layout Panels