I created a partial CUI, in which I created a new ribbon tab, then created several panels for it. Then using the CUI editor, I loaded the partial cui. I selected my current workspace, and in the right window the customize workpsace button appeared. by selecting the button, it allows you to place a check mark next to anything you want to show up (in the ribbon, toolbars, menus, etc.) then you select finished customizing, hit ok, and it should be there. My ribbon tab is not contextual, as it is more of a replacement for the menubar. Instead of using dropdown menus, I have dropdown flyouts from an anchored-auto-hiden Ribbon.