Catching save work item by operation participant

I want to perform some operation after saving work item.
I have created new plug-in for operation participant ("SetConfirmerFollowup"):

<plugin>
<extension
point="com.ibm.team.process.client.operationParticipants">
<operationParticipant
class="com.example.followupactions.SetConfirmerFollowup"
id="com.example.runsetconfirmer"
name="Set Confirmer Followup test"
operationId="com.ibm.team.workitem.operation.workItemSave">
</operationParticipant>
</extension>
</plugin>

and added code:
public class SetConfirmerFollowup implements IOperationParticipant{

public void run(AdvisableOperation operation, IProcessConfigurationElement processConfigurationElement,
IParticipantInfoCollector participantCollector, IProgressMonitor monitor) {

String thename = processConfigurationElement.getName();
JOptionPane
.showMessageDialog(null, thename);

}

}

Now, running RTC (using eclipse, or by copying the plugin fragment to plugins location on RTC) shows me this operation as available follow-up in the project configuration's save item operation.

The project configuration now shows:
<operation id="com.ibm.team.workitem.operation.workItemSave"
<followup>
<followup-action id="com.example.runsetconfirmer" name="Set Confirmer Followup test"/>
</followup>


But, it's not working.
Saving workitem won't activate this operation participant.
Maybe I should set it on server? Or missing something?

Thanks,
Moti