When I try to Add() a tab to another ribbon, I get the error "the specified tab belongs to a different ribbon", the same happens if adding the tab to a CAB UIExtensionSite. How do I detach a tab and move it to a different ribbon ?

This is a composite CAB application where the biz-module developers shall add a ribbon at design-time to their module, and at run-time the biz-module ribbon tabs must be attached to the main shell applications ribbon. Like when moving standard WinForm tab pages between two tab containers.