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https://issues.apache.org/jira/browse/WICKET-2214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765167#action_12765167
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Gabriel LANDON commented on WICKET-2214:
----------------------------------------

It's written in the javadoc of the ModalWindow :
*...
* If you want to use form in modal window component make sure that you put the 
modal window itself
 * in another form (nesting forms is legal in Wicket).
 * 
 * @see IPageSettings#setAutomaticMultiWindowSupport(boolean)
 * @author Matej Knopp
 */

Putting the ModalWindow inside a form also solve the problem of the DatePicker 
not displaying properly with IE.



> Form tag in ModalWindow html code causes nested html forms when ModalWindow 
> is used with panel that contain forms
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: WICKET-2214
>                 URL: https://issues.apache.org/jira/browse/WICKET-2214
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket-extensions
>    Affects Versions: 1.3.5, 1.3.6, 1.4-RC2
>            Reporter: Jor
>            Assignee: Matej Knopp
>         Attachments: modal.js.patch
>
>
> There is an extra form tag in modal window html code (modal.js -> 
> Wicket.Window.getMarkup function), it causes problems when ModalWindow is 
> used with panel that contain forms. 
> I haven't found any use for that form tag as it cannot be referenced from 
> java code (it has no wicket id) and it only causes problems by creating 
> nested form tags (outter form from modal html with no wicket id and inner 
> form from panel with wicket id) that some browsers cant handle and its 
> againts W3C html specification.
> I had to replace it with div tag to get my panel working.

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