Each Ribbon tab contains a set of Ribbon groups. Ribbon groups allow you to consolidate related controls within a tab. Grouping related controls like buttons, edit boxes, drop-downs etc in a RibbonGroup makes it easier to identify a commonality between these controls and also to locate the commands. The group can also include a dialog box launcher button which provides access to advanced capabilities.
The example attached shows you have to add a group to a ribbon.
For quick and easy implementation of XML code for ribbon, use an XML editor for Offce 2007/10.
Custom UI Editor
Alternatively, you could also use Andy Pope's RibbonX Visual Designer
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