A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
The issue is more likely to be your code really. Are you sure it's correct.
If you are going to customize ribbon and expanding the AddIns button to show addIns and Com AddIns then these WILL be greyed out because you cannot delete / alter them in this way. This is normal.
The AddIn button is nothing to do with the Addin tab which will only appear if there are AddIns that create it either through XML (best in 2010) or with legacy vba code.