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https://issues.apache.org/jira/browse/WICKET-1964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igor Vaynberg updated WICKET-1964:
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    Fix Version/s:     (was: 1.4-RC2)
         Assignee: Igor Vaynberg

removing 1.4 fix version, we cannot break api that badly in that branch

> Add IBehavior.isVisibilityAllowed(Component) or so
> --------------------------------------------------
>
>                 Key: WICKET-1964
>                 URL: https://issues.apache.org/jira/browse/WICKET-1964
>             Project: Wicket
>          Issue Type: New Feature
>          Components: wicket
>            Reporter: Anatoly Kupriyanov
>            Assignee: Igor Vaynberg
>             Fix For: 1.5-M1
>
>
> A behavior should able to control component's visibility.
> Discussion 
> http://www.nabble.com/make-invisible-if-model-object-is-null-tt20769823.html 
> explains useful usecase

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