Hi Leo.
I don't have any specific code sample to send you but the idea is the one you guessed: hide and show items at runtime. When you do so (and we do it a lot) forms get quite "empty" after hidding something and you would be nice to have a way to "repack" the interface after changes.
But I must tell you I was not expecting a quick response to this subject, since, like we say around here, we can live quite nicely with it. It was just an idea to present to Fourjs in the hope that somewhere in the future we could see this features included in a new version.
This said, thank you very much for you answer, but, I repeat, this is not an urgent matter.
Best regards
Nuno