Do we should tell all of the cases to GRIN in show text file?
There is an example for the most complex remote control handling at chapter 23. And the show file is like the following, which describes all of the selected(and activated) state of the each letter in the 3x3 box.
But, I'm really sorry to say that this is really tedious and hard works. In addition, the bottom of show text file, in the "rc handling" part, we should contain "forwarding address" that takes us to get the correct behavior we wanted with 'grid' keyword.
In my personal opinion, even I don't get the concrete solution, lightweight extension mechanism might avoid this hard coding via