Anyone using Madnox use the "Play All" feature? Step inside

I can see in the code where and when it is used and it is script controlled which is being removed, I will convert it to either TMDb helper or the skins built ins controller. 

What I'm having problem is seeing exactly how this is supposed to work. I see it in music / albums and music videos... Followed the format of music videos where the files need to be Artist - Title.mp4 and when I add them to the music videos I add them to library. I've seen a few times the "Play all" button and then when I try to go back and do it again, the button is only "Play".

So what I need is, can someone give me a proper way to evoke the "Play all" button because I can't seem to figure out how to do it reliably. I don't want to tear something up and chase my tail for a user error in making it work, so if you use this, can you give me an A, B, C, D method of how to do it repeatedly so I can get this over the finish line? 

Thank you,
Chris