The RA-IR supports 15 scenes and includes the 19 IR commands listed below. The RadioRA in my MX-900 software's editor's IR database does not include most of these, so I instead started with one the generic Lutron codes (tried all of them). As mentioned above, this approach did not work well. And I am currently using whatever is in the Logitech Harmony database under Lutron RA-IR, which does work well.

Scene 1
Scene 2
...
Scene 15
All On (= Scene 16)
All Off (= Scene 17)
Brighter
Dimmer