So you have Ribbon, Menu, RibbonTab, and then the Ribbon Group. When you create a new Ribbon application, you get this wireframe ready – so its easy to start.
You got the group – lets populate it. If you look at the Xaml, the Ribbon controls have a SmallImageResource and a LargeImageResource property. This enables the ribbon to use the appropriate image when resizing. Each control can also have rich tooltips by setting the following properties