how to allow gridScreen to update an interval game score
I would do some specific things on grid screen that allow update an interval game score on each item of gridScreen object, but I don't know how custom gridScreen or create new one to support my business requirement like this
Re: how to allow gridScreen to update an interval game score
No idea what "interval game" is. You have multiple hacky options - from showing score as breadcrumb (setBreadcrumbText()) through changing list name (setListName()) to changing item description or image.
Btw, Roku*... roGridScreen has undocumented ".setTitle()" method? What's that for