Tri-Peaks Solitaire on Pogo

After logging on to Pogo, we click on "Games" (at the top of the screen) and a drop-down menu appears. I always click on Solitaire to choose my favorite game, Tri-Peaks Solitaire, but I've noticed it's never there.  Why isn't Tri-Peaks SOLITAIRE listed among all Pogo's SOLITAIRE games?  It's no big deal, I always just key in Tri-Peaks in "Search". 

I'm sure it's just an oversight on Pogo's part but thought you'd want to know.  

Thanks!!