In this case I think the correct approach would be to set
> the zorder higher on one axes, and in that axes' callback
> programmatically invoke the same event for the other
> axes. I will look at the example and implement/comment
> this approach.
I don't feel strongly about this, but since the patch I applied does
set a navigation toggle flag, is it not preferable to simply fix the
logic error and allow the user to set this flag rather than have to
set a callback?