HELP. Disable next button on interactive until finished!

After reading this article (http://www.articulate.com/support/kb_article.php?product=st1&id=cchsaumqs2v6) I tried to make this functionality work in one of my courses with a tabs interaction. However, I cannot get the last tab to show the content of its layer without it advacing to the next slide. I have attached the interaction to this post. 

Any tips?

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