require 'hotcocoa/graphics'
include HotCocoa
include Graphics

NSApplicationMain(0, nil)

application do |app|
  canvas = Canvas.for_rendering(:size => [400,400])
  canvas.background(Color.white)
  win = window :size => [100,50]
  b = button :title => 'Hello'
  b.on_action { puts 'World!' }
  win << b
  puts "HERE"
end