You can use the Ribbon Designer to assign a CheckEdit to your RibbonPage.
This will shown as a normal CheckEdit. To Add a description to your RadioGroup you have to Add RadioGroupItems via
radiogroup.edit.items
Property. Each item can hold a description and a value. The description will be displayed in Ribbon if the RibbonPage is big enough to show the descriptions! Further information here:
http://documentation.devexpress.com/#windowsforms/clsDevExpressXtraEditorsRadioGrouptopic