Using Flash to Control Articulate Navigation

I'm new to Articulate, I'd really appreciate if you could help me.

I have a game built in Flash (AS 2.0 and exported to Flash Player 8). I've imported it to my Articulate 13 project and it works great. I don't want users to be able to advance to the next slide until they finish playing the game, so I got rid of the standard NEXT / BACK buttons for that slide.

Now I'm trying to create a button in my Flash file to advance users to the next slide when clicked at the end of the game. I've tried many things including the code below found on a different blog and it doesn't work. I've also tried to include _level0 and it didn't help. Thanks! 

mcButton1.onRelease = function()
{
ArtAPI.PlayNext();
}