Form, containing FileUploadField and UploadProgressBar throws an exception when 
removed from the parent
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                 Key: WICKET-3200
                 URL: https://issues.apache.org/jira/browse/WICKET-3200
             Project: Wicket
          Issue Type: Bug
          Components: wicket, wicket-extensions
    Affects Versions: 1.5-M3
         Environment: Windows 7, java 1.6, wicket 1.5m3
            Reporter: Ivan Vasilev
         Attachments: quickstart.rar

There is a form which contains FileUploadField, UploadProgressBar and a submit 
button. The form is added to a WebMarkupContainer. When the form is removed 
from the WebMarkupContainer an exception is thrown: 

java.lang.IllegalStateException: Tried to remove a behavior that was not added 
to the component. Behavior: 
org.apache.wicket.extensions.ajax.markup.html.form.upload.uploadprogressbar$formenab...@1d433c1

This can be observed in the attached quickstart.

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