How to listen to a serial port status

Dear all,

In a GUI associated to a class I've created, I've got a serial communication object. I would like to add a listener to its status "open/close" so that it can be reflected into the GUI by a "connected/disconnected" display. I manage to listen to properities of my own class, but it doesn't seem possible to listen to the property of the serial port (in my class, it would be addlistener(obj,'SerialComm.Status','PostSet',@callback).

Is there a way to do that ?

Thanks a lot

Stephane