Drawing Native OSX Windows with D

[Mike McKee via Digitalmars-d-learn]

Does anyone have a demo that shows how I can call the native OSX 
API to draw a basic window that's minimizable and can be closed?

I was thinking of making an installer for the Mac, you see. So 
for instance, people would download a very thin .app file and run 
that. Because it only uses native window APIs on OSX, it wouldn't 
be a huge download. That way, this installer can then download 
the larger payload of my Qt/C++ application that I composed.