I a still seeking a solution, if anyone has it seems no one whom has gotten mraid working, cares to share that information. I have another thread here explicitly seeking information on integrating mraid.expand(); and mraid.close();
You can see this thread here.(Any Success on making Expandable ads in Edge animate cc 2015 use mraid for expanding and closing?) i will be testing over the coming weeks to try and get this working and if i do i WILL share this information.