Toggling Closed Captioning - SL2

I have created closed captioning according to the instructions found here (http://blogs.articulate.com/rapid-elearning/how-to-add-closed-captions-to-storyline/) but I need to be able to toggle them on and off.  Is there a way to add a button to the player, preferably at the bottom?  Or is my only option an on-screen button?

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