Uber hotbuild: How to build anchors and orbital factories?

Is it possible to build anchors and orbital factories just using the keyboard when an orbital fabber is selected? I thought it failed because 'select commander' was also set to b, but removing that still didn't work. You can now see the 'b' next to the orbital tab, but there is no key set to select an anchor or orbital factory.

Works for me, but I've remapped all the keys. Anchor should be the same key as metal extractor.

Thanks. It didn't work when I tried yesterday, but enough messing about with the settings and now it does. Before there was no key next to the icons, so something else must have been mapped erroneously.