Hi Stefano,
The ribbonBar control have are a lot of functions to do that.
If you start you have to know that the Application Button, Tab Button and Categories have different functions.
To handle Application button start with GetApplicationButton and call GetMenu for the RibbonApplicationButtonItem. For the Menu you can get the Master items and the Recent Items.
To handle Tab button start with GetTabButtonCount and go to Tab Buttons with GetTabButtonByIndex.
Same with Categories: GetCategoriyCount, GetCategoryByIndex.
Inside a Category you can go down through Panels and Groups with GetChildItemCount and GetChildItemByIndex
HTH you to start,
René