Custom exit button in Articulate Presenter 13

Everyone,

I am working on an Articulate project in Studio 13 Pro and have been asked to add a custom exit button at the end of the course.  I have searched the forums and have found a few discussions around this topic, like;

https://community.articulate.com/discussions/articulate-presenter/custom-exit-button 

https://community.articulate.com/discussions/articulate-presenter/adding-a-course-exit-button-from-the-back-end

So far, I have yet to find something that will work.

I know that Studio 13 has an SDK but I was unable to find anything relating to an exit button in the documentation.  

Anyone out there have something they are using that is working for them?

Scott