content: sub Main()
      showChannelSGScreen()
  end sub
  
  sub showChannelSGScreen()
      screen = CreateObject("roSGScreen")
      m.port = CreateObject("roMessagePort")
      screen.setMessagePort(m.port)
      scene = screen.CreateScene("MainScene")
      screen.show()
  
      scene.observeField("appExit", m.port)
  
      while(true)
          msg = wait(0, m.port)
          msgType = type(msg)
  
          if(msgType = "roSGNodeEvent")
              if(msg.getField() = "appExit")
                  screen.close()
              end if
          end if
      end while
  end sub