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https://issues.apache.org/jira/browse/WICKET-2153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714024#action_12714024
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Igor Vaynberg commented on WICKET-2153:
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for a solution see WICKET-2202

> TabbedPanel accepts only ITab(s)
> --------------------------------
>
>                 Key: WICKET-2153
>                 URL: https://issues.apache.org/jira/browse/WICKET-2153
>             Project: Wicket
>          Issue Type: Improvement
>          Components: wicket-extensions
>    Affects Versions: 1.4-RC2
>            Reporter: SoulSpirit
>            Priority: Minor
>             Fix For: 1.4-RC3
>
>
> TabbedPanel manages a List of ITab(s).
> This prevents instantiation of TabbedPanel(s) made of any custom ITab 
> implementation.
> Every reference to List<ITab> should be converted to List<? extends ITab>.
> Alternatively, TabbedPanel should be declared as:
> public class TabbedPanel<T extends ITab> extends Panel{}
> depending on the preferred strategy.

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