I'm back on updating the Ribbon menu and have run into another issue.
As an FYI,
this topic was resolved by changing to a Ribbon Gallery. Apparently Autodesk has no desire to fix the issues with the ribbon API so we just grin and develop workarounds ...
... which is exactly where I am now.
I want to have the labels above and below the gallery to be centered on the gallery control but I have found no way to manage this except by adding various numbers of spaces and because it is dynamic it is subject to change.
Pics show current and desired