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I'm not able to reproduce your problem using your code: anyway i'm quite sure that the problem is that the size content (panels&listboxes) is unknown to the container (the window) ex-ante. Try to use vflex & hflex attributes instead of width & height 100%: 9 times over 10 it solves the prob. http://books.zkoss.org/wiki/ZK%20Developer's%20Reference/UI%20Patterns/Hflex%20and%20Vflex