sorting using rich:column

[radaruser]

Hi I am trying to sort a numeric column within a datatable. the comparator is sent the entire row object rather than the sortby field. how do I distinguish which column in the row object to sort on?
at present the numeric column is sorted as if it were a string so the ordering is wrong.

[radaruser]

fyi
it seems to be a bug that has been fixed in the latest version.
http://jira.jboss.com/jira/browse/RF-2915