I'd like to notice that after adding a new template for non-existing device (this is a GSD Interface device) the device is added automatically in the system and didn't display anywhere: Interfaces or GSD. I'm not sure is this a bug or feature?
maybe this won't be of any help. But you should probably see it under Advanced-Templates. Sometimes I get into same trouble, cause when you add some child device, you only get those listed that can be controlled by that parent = so only subset is displayed...