This is a not *that* straight forward. For convenience, Devices offers information from the DeviceClasses and used to get that stuff from the engine. In order to solve this I've added a pointer to the DeviceClass in Device. This however, implies that DeviceClasses must be created before Devices and destroyed after them. As the general concept of the system is built in such a way this isn't an issue but it requires some extra throughts when tearing down things.