You will need to make your MBean an XMBean for this to happen. This will also allow you to give more meaningful descriptions for your methods.
There is some information on XMBeans in the pay-for documentation, but basically you need to write an additional deployment descriptor and reference it from the jboss-service.xml (there is no additional code you need to write).
Making it an XMBean also allows for the MBean to emmit notifications.
Thanks, we have the for-pay docs so I'll dig it up.
You can also use XDoclet to generate the xml discriptor for you.
Thats what we did. Its not perfect but it saves some hand coding.