Setting the Tooltip on the Excel Ribbon

I have so much to do with this project. Currently trying to get the Tooltip to work from the Ribbon in Excel.

I found something from https://groups.google.com/forum/?fromgroups=#!topic/exceldna/7uMLPOrRJqw which lists the following:

The other parts of the tooltip popup are customised with "screentip" 
and "supertip": 
   <button .... screentip="This is the screentip " supertip="This is the supertip " /> 
and you can do a getSupertip callback. 

I'm using a tool called "Custom UI Editor for Microsoft Office" and if you're modifying the Ribbon it is a must have.