CC disappears when using custom pause button in Storyline 360

I have a course I've created with a custom navigation shell that uses the new CC functionality in Storyline 360. When my custom "Pause" button is clicked, the CC disappears and only reappears when "Play" is clicked. I've tried pausing the timeline having the pause button open a layer that pauses the base timeline, and alternatively by just having the Pause button pause the timeline (Pause timeline on This Slide When the User Clicks). Both ways the CC disappears.

I've noticed that the CC does NOT disappear if I turn on the standard Storyline progress bar and use the Pause button that appears there to pause the course. Is it possible to get the code that Storyline is using on that button and put that onto my custom button? Or is there another way to pause the course so that the CC box remains on screen?