that's just to load the data... applying it to a gridscreen is up to you. It took me a while to get my head around how to structure the roContentNodes properly for the different lists, they each require a specific hierarchy of nodes to work right.
EDIT I take that back, that example is supposed to work with a RowList. make sure `mediaitem.xml` is in your `components` directory. I don't have time to debug it right now...
I copied over your examples to my own project and I actually did not see any RowList appear, just a blank screen, but no errors either (which I guess is good lol). I'm using your crash course/JSON feed example with the Roku Sample Tutorial so hopefully I'll get it working soon. The SceneGraph stuff is a whole other level for me... thanks for the help