Could someone with AGL experience help me out here?

I'm using Rex to make a game. I want to display images. However, unlike the Command Documentation's example, if I try to use the i command as the result of an option, Rex won't do it:

Command "i" in the wrong context. This command is not allowed in code parsed in (or in a function called from) an option code block.
Line: "i map.png"
Parsing was stopped at that point.

"i" works if it's not in an option block, and I can always make a state variable, like view_map, and have it set each time the button is pressed, but that seems rather ugly compared to

* map Look at the map.
i map.png

Why won't this work? It seems like it should.