ZK - Open Source Ajax Java Framework

Hello all,
Could someone give me the installing steps of zk, I follow these steps:
(1)Copied jar of zk-bin-3.5.2 into lib folder.
(2)Put jar on classpath.
(3)wrote viewhandler to inegrate with my framework.
(4)Developed a small appl and ran successfully.
(5)But when I use some classes of zk like org.zkoss.zul.Constraint to show customized constraint then I got error of component not found zkmax.
Is zk studio or zk-source necessary to install or am I something missing. Please help me.

search for zk userGuide to install zk

"zkmax" is provided by "ZK Enterprise Edition":

http://www.zkoss.org/download/zk.dsp#zk

HTH