Stopping MessageBus or ActivationSpec using wsadmin tool

Hi all,

Is there any way I can stop a MessageBus using the wsadmin tool?
I found a documentation regarding ListenerPorts ([url]http://publib.boulder.ibm.com/infocenter/wasinfo/v5r1//index.jsp?topic=/com.ibm.websphere.base.doc/info/aes/ae/rxml_startport.html[/url]) but I need to shut down both a listener port and another MDB that is bound to an ActivationSpec .
I am planning to shut this down for maintenance situations. I guess that two possibilities would be to shut the ActivationSpec and the MessageBus that delivers the messages to this ActivationSpec.

Does anyone know if it is possible? I am using an WAS 6.1 ND.

best regards,
Rafael Ribeiro

I just found it myself, getting the MBean "type=SIBMessagingEngine" and invoking stop on it does the trick.