Component#onConfigure() - Create a new callback to help manage states such as
visibility, enabled, etc
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Key: WICKET-2955
URL: https://issues.apache.org/jira/browse/WICKET-2955
Project: Wicket
Issue Type: New Feature
Reporter: Igor Vaynberg
Assignee: Igor Vaynberg
Fix For: 1.4.10, 1.5-M1
Currently it is difficult to manage visibility and enabled states. overriding
getters comes with the price of multiple calls per request, while overriding
onbeforerender causes problems with it no longer being called once a component
is invisible.
we should have a callback that is always called before the component is
rendered, and make sure it is only called once per request.
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