I think you have to make a new object group for your map with your meshes.
Object maker:
(http://i1316.photobucket.com/albums/t607/AlphaEclipse/5850f51c-4b65-4b64-a823-a0422f751020_zps41beee41.png)
Just add the new meshes in there then apply them to the map. :3 When the map exports the objects will work!