How to set limit the bean pool size for stateful session bean in Weblogic 8.1

Hi all,
I am tring to observe how a stateful session bean is managed by the
container.
I want to limit the bean pool size to two beans, so I can see the
ejbPassivate and
ejbActivate methods being called by container when I have 3 clients.
I am using weblogic 8.1. In the property editor of the session bean,
tuning section, there is a property called "max-beans-in-cache". Is this
where
I can set the limit? However, I cannot see the passivate and activate
functions
being called when I set it to 2 or even 1.

Could anyone give me a hint?

Thanks a lot,
J Xu