content: sub Main(args as object)
      screen = createObject("roSGScreen")
      m.port = createObject("roMessagePort")
      screen.setMessagePort(m.port)
      screen.createScene("MainScene")
      screen.show()
  
      while(true)
          msg = wait(0, m.port)
          msgType = type(msg)
          if (msgType = "roSGScreenEvent")
              if msg.isScreenClosed() then return
          end if
      end while
  end sub
  