Glad to clear things up. You are very observant and resourceful! Our QML API at 10.2.6 was built directly on top of the C++ API, and so we needed to expose the MapQuickItem. This was supposed to be an internal class for our QML API build to pick up (which is why you don't find the header in the public SDK), but we accidentally included it in our doc build, so you see it there. This was not intentional, so if you are able to get something to work, I would say that is impressive, but we may not be able to assist you if problems arise. Quartz will officially support this pattern, and I think you will find it to be very easy and straight forward.