Excel Add in Ribbon Gallery control

Question

I am looking for example on how to implement the ribbon gallery with Header intermediate (VSTO).

I am working on Excel Add-in in c# where gallery control is used, but how to implement or show items with groups as shown in image.

Each item are grouped with certain header.

Answer 1

As far as I know this is not possible.

There are quite a few things like this in the Office ribbon: you can see that it can be done since the official Office ribbon has it, but there is no way to do it when developing. Two examples are the one you posted and in ribbon gallery (like the Chart styles in Excel).

Here is an similar question answered by one of the authors of the RibbonX book: http://www.excelguru.ca/forums/showthread.php?612-Menu-containing-galleries-and-menu-separators