[Default: false] [Deprecated as of release 5.0.0]
It specifies whether to disable all elements behind the modal window at the browser. If disabled, the performance is better.
Tip: This option can be considered as obsolete since 3.0.4. The user is almost impossible to change focus to an element behind the modal window, without disabling them.
Note: in ZK 3.0.3 and earlier, the option is default to true.
Last Update : 2012/5/3
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