Please use the "Create New" button on a wiki page to create new subpages, such as Mafia: The City of Lost Heaven/WMG. Doing so will prepopulate the page with all the necessary markup for making a page look and behave like an All The Tropes page. If for some reason you do not want to use the the button or the Page Creator tool, it is incumbent upon you to properly mark up the page by hand.
I have recreated Mafia: The City of Lost Heaven/WMG with the required markup, so you don't have to. But the wiki staff would very much appreciate it if in the future you didn't add to our work load.
Thank you.
-- Looney Toons, admin
CC: @Labster, @Robkelk, @QuestionableSanity, @Derivative, @SelfCloak