Hi Paul
Thank you for your quick reply; I had to zip it because of the size issue.
The custom buttons are located at the beginning of the start tabs and the callbacks are located inside the module "modRibbonX"
In fact, there are 2 menus on each sheet. The buttons in the first one should act like checkboxes, which works fine. Those in the second menu should act like dropdown.
The reason for that is simply that I don't like the dropdown visual style.
Matrix_v2.zip
