Hi Chan,
I was looking for the same thing. In the PTC Knowledge base the only reference I had was this:
https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS45954
For someone who is just getting into Windchill customization and jsp, however, that article leaves a lot to be desired. Basically, it tells you it is possible, but leaves lacks details and an example.
I am wondering if you ever found a better answer?
Micah