I am sure you should check it out in:
Look in the following example:
Look, that we are using the Thread class inside our simple .zul file.
Take a look in the following image, and the kind of the cool stuff you can do with:
I am creating some modules for NetBeans, to try turn the ZK development simple , I am also looking for enough time develop it, as sooner as I finish, I will publish it here. The Following image shows the syntax highlight and a Project template, which allows users create a new ZK Web Project in NetBeans: