In Office 2013 the user interface is a ribbon which is made up of various tabs also known as "The Ribbon".
Office fluent UI (user interface)
The term RibbonX is used to described the programmability mechanism for customising the Ribbon interface.
Ribbon Best Practices http://msdn.microsoft.com/en-us/library/windows/desktop/cc872782.aspx
Floating toolbars - http://word.mvps.org/faqs/customization/customizeribbon.htm
Using VBA Code
Even though the customisations are defined at design-time most of the controls attributes can be modified at run-time using VBA.
A few of the controls can be totally dynamic so their structure as well as their attributes can be defined at run-time.
All the built-in controls are available for our and be overridden, executed and queried for their images, caption and so far.
Ampersand - & [& #38]
Forward Slash - / [& #47]
Backward Slash - \ [& #92]
The getImage callback can be passed either an idMso name or an Ipicture object to provide a built-in or custom image.
Every RibbonX container item should support having its contents set dynamically.
Both the RibbonX XML and any images in the file should be exposed through the workbook object's CustomXMLParts collection, so they can be easily read or updated from VBA
ExecuteMso should be able to take an optional itemID or ItemIndex parameter.