Control Closed Captioning with Custom button?

Hi.  I am building a course but I am NOT able to use the standard "Menus and Controls".  I have this option turned "Off" in the Player Properties.   Because of this I am using all custom buttons including one for Closed Captioning. I am not seeing a Trigger for Showing/Hiding CC.  How do I do this?  Do I have to use JavaScript? 

Thanks for any help you can give.