Just thought I would note that RokuKC updated the ifGridScreen documentation today.
These were added:
SetListPosterStyles(styles as Object) as Void
SetErrorPoster(sdPosterUrl as String, hdPosterUrl as String) as Void
SetCounterVisible(visible as Boolean) as Void
SetFocusRingVisible(visible as Boolean) as Void
And it looks like ClearMessage was modified. (No longer takes a boolean)