Hi,
The SharedWhiteBoard uses a class called SharedCusrsorPane for showing all of its cursor markers. You may try out two ways of removing it. You can extend SharedWhiteBoard class and remove the SharedCursorPane instance and make it null.
Or you can extend SharedWhiteBoard and set the pollInterval of SharedCursorPane to a very very high value so that the cursor events don't get fired.
The 2nd way I think would be easier and less work.
PollInterval is the time duration after which cursor messages are being sent. I haven't tested these approaches but it should work.
Hope this helps.
Thanks
Hironmay Basu