isRemoteKeyPressed() only working with few buttons

I am using the roGridScreenEvent, isRemoteKeyPressed(). It is only returning true when I press either Instant Replay, Info, Play, "A" or "B". According to the documentation, any key press should return true.

http://sdkdocs.roku.com/display/sdkdoc/ ... creenEvent
http://sdkdocs.roku.com/display/sdkdoc/ ... ntrolEvent

I want to know when my arrow keys are being pressed.

Why is this only catching those few button presses?

How can I catch the directional button presses?

Thank you for your help. 🙂