Add IBehavior.isVisibilityAllowed(Component) or so
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                 Key: WICKET-1964
                 URL: https://issues.apache.org/jira/browse/WICKET-1964
             Project: Wicket
          Issue Type: New Feature
          Components: wicket
            Reporter: Anatoly Kupriyanov
             Fix For: 1.4-RC2, 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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