Shape Layer gradient fill onscreen controls

I've read the online help, but I can't seem to get the in-comp HUD gizmo-widget-thing to appear when working with a Shape Layer's gradient fill.

I can only modify gradients numerically in the timeline. I've toggled the mask/shape path visibility button, and of course the layer and shape is selected.

I've seen it before, so I'm obviously missing some step.

CS6 11.0.2, OS X 10.6.8, Quadro 4000.