Steps to Reproduce

1. run attached jsp with ZK 7.0.2
2. click "Test Button error" button

Actual Result

Javascript error shows:

Uncaught TypeError: Cannot read property 'parent' of null zk.wpd:20123
(anonymous function) zk.wpd:20123
mtAU zk.wpd:18371
doEnd zk.wpd:17907
zk.copy.setLoaded._zkf zk.wpd:17945
(anonymous function) zul.box.wpd:1651
doEnd zk.wpd:17907
zk.copy.setLoaded._zkf zk.wpd:17944
(anonymous function) zul.wnd.wpd:2333
doEnd zk.wpd:17907
zk.copy.setLoaded._zkf zk.wpd:17944
(anonymous function) zul.box.wpd:1651

Expected Result:

Message box shows.