Pick Many, Text Entry sequence

Hi

Here's what I'd like to have students do: Click some Pick Many boxes, then write a short reflection on why they chose what they did. I'd like the checkboxes to be visible but unalterable when they write their reflection. 

I've been trying this as two subsequent slides, with some javascript to store an array of the checkbox states, triggered on the first submission, followed by an on-timeline-start trigger that sets a 'dummy' copy of the checkboxes on the following Text Entry slide. The problem is, I don't know how to refer to the states of the Pick Many checkboxes, either to read them into my array or to set them once I have it. Is there documentation anywhere that lists the complete set of javascript calls that can be made on the player object? I've looked a the 'Using Javascript and Triggers' pages, but these don't seem to have the info I need.

I've also looked into doing this on a single slide, but I'm not sure how to do both submissions in that case. Any help would be greatly appreciated! Thanks!