How to get manual focus Nikon 105 VR lens in Nexus housing

Hi, I'm buying the Nexus housing for my Nikon D200 camera and 105mm VR lens. I'm hearing that there's no focus switch knob s.m.c. on this housing.

Is there any other way to get the camera to focus manually or at least keep the focus once it's done so the lens doesn't keep going back and forth all the time in low light conditions?

Any ideas are welcome!

Thanks, Erika.

Contributed by Erika Antoniazzo added 2007-07-30

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The Bends: by Craig; Ask any scuba diver what is the one thing they fear most when diving and they will tell you it is the bends. However, if you get a group of divers together they will no doubt joke that '... we will probably all end up bent sooner or later!'. I myself often joked to friends and family that 'I'll probably just end up bent ...' and like most divers I used to think that it would never happen to me ... but it did. I got bent.