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https://issues.apache.org/jira/browse/WICKET-365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12478721
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Frédéric Bertin commented on WICKET-365:
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then why not simply adding the style="display:none" attribute to the component 
tag, instead of creating an additional <span> ?

> Go from setVisible(false) to setVisible(true) on a component in ajax does not 
> work
> ----------------------------------------------------------------------------------
>
>                 Key: WICKET-365
>                 URL: https://issues.apache.org/jira/browse/WICKET-365
>             Project: Wicket
>          Issue Type: Bug
>            Reporter: vincent Demay
>         Assigned To: Igor Vaynberg
>             Fix For: 1.3, 2.0
>
>         Attachments: Component.patch.txt
>
>
> Because no tag is generated by RenderComponent when a component is not 
> visible. The attach patch simply generates a <span 
> id="ComponentMarkupId"></span> when component is not visible and 
> OuputMarkupId true. So we can now use ajax on setVisible(false component)

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