I've provided a onTrackballEvent in a ItemizedOverlay<OverlayItem>
that I've sub-classed.  I do not seem to be getting any events through
this method.

I've over-ridden onTap(), draw(), createItem() and size(), and those
all work correctly.

Is there some reason I wouldn't be seeing trackball events?

The actual goal here is that I have a MapActivity with a number of
icons on the screen.  I'd like to use the trackball to move the focus
to icons on the screen (without scrolling to icons that are on the map
but off-screen), and click to bring up additional information.

Thanks,
--jc
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