Battery Grip for Nikon D5000 not working?

I recently purchased a battery grip for my Nikon D5000, and can't get the vertical shutter button to work. I plugged the patch cable from the battery grip to the accessory input on the camera, and inserted the battery. The camera works fine with the battery grip, but the vertical shutter button on the grip doesn't seem to work. Is there some setting I need to do to get it to work?

The quality of aftermarket grips varies.