How can I see the history of change set comments?

Comment from Jean-Michel in Enhancement https://jazz.net/jazz/web/projects/Rational%20Team%20Concert#action=com.ibm.team.workitem.viewWorkItem&id=72237
There are APIs today which allow you to retrieve the old comments on a change set, so nothing is lost. Once you have a IChangeSet in hand, simply get the IItemManager.fetchAllStateHandles(), then for each handle get the states. Each state has the comment.

I can see the current comment with changeset.getComment(), but I haven't been able get the previous states.
What code should I use?

public static void getChangeSetComments(ITeamRepository repo, IProgressMonitor monitor) throws TeamRepositoryException, ItemNotFoundException, ComponentNotInWorkspaceException {
IWorkspaceManager wm = SCMPlatform.getWorkspaceManager(repo);
IChangeSetSearchCriteria criteria = IChangeSetSearchCriteria.FACTORY.newInstance();

//Get any 10 changesets.
List<IChangeSetHandle> changeSets = wm.findChangeSets(criteria, 10, monitor);

for (IChangeSetHandle changeSetHandle : changeSets) {
//For each changeset
final IChangeSet changeSet =
(IChangeSet) repo.itemManager().fetchCompleteItem(changeSetHandle, IItemManager.REFRESH, monitor);

//For the given change set, get all the states. Each state will have a comment.

<B> //These next lines are where I don't know what to do. I put some code here just to experiment.
//I'm going in a circle. fetchAllStateHandles returns a few rows per change set, but it's not
//the number of revisions. cs.GetComment() returns the most recent change set comment.
final List&lt;IChangeSet&gt; stateList = (List&lt;IChangeSet&gt;) repo.itemManager().fetchAllStateHandles(changeSet,monitor);
for (IChangeSetHandle csHandle : stateList) {
final IChangeSet cs =
(IChangeSet) repo.itemManager().fetchCompleteItem(csHandle, IItemManager.REFRESH, monitor);
System.out.println(&quot;state comment=&quot;+cs.getComment());
</B> };

System.out.println(&quot;comment=&quot;+changeSet.getComment());
}
return;
}
}

If there's a Junit or API documentation I should look at, please point me to it.

Thank you