How to include a radio button in rich:datatable?

I have 3 rich:datatables with 2 columns each. I need to include one more column in all these 3 data tables, which will be a radio button. The radio button group for this should be the same for all the three data tables. i was able to do the same with flex and actionscript, but now i need to implement with JSF-richfaces. so can you please suggest me on how to proceed with this?

Doing this search in google:
http://www.google.es/search?sourceid=chrome&ie=UTF-8&q=richfaces+radio+button+table+%22td%22

I found this answered question:
http://stackoverflow.com/questions/3626798/how-to-get-radio-button-group-functionality-for-each-row-in-a-table-using-jsf

Maybe it will help you.