Hello John & NG, thank you very much for your answer. It
> seems to me that using set_frame_on() just hides/shows the
> whole axes content. Probably I didn't make myself clear
> (sorry for my bad english). I attach a jpeg example of
> what I mean for bon on/off. The figure at the left if with
> box "off", while at the right the box is "on".
Ahh, now I understand what you want. Yes, this is a persistent
request and one we have not yet supported. It is on the goals page,