Bug ZK-2371: Validation message is not shown every time. It depends on the height of the browser window.

Note: fixed after merged "refix ZK-2294"

@commit: cd9219212d2a49e1dccc3aa742538e36d3479efc
Merge pull request #97 from hanhsu/B70-ZK-2371

Bug ZK-2371: Validation message is not shown every time. It depends on t...