There's a problem with panel that have components in wicket:head and are 
rendered using ajax.

The problem is that first time, the wicket:head is rendered. But any 
subsequent call to component.renderHead() is ignored, because the head 
has already been rendered (the state of rendering head is stored as 
component flag). So every subsequent call to component.render will fail, 
because components placed to wicket:head will not be rendered. What can 
we do about this?
  Wouldn't it be best just to ignore component use check for components 
that are in <wicket:head>?

This problem can be reproduced by e.g putting datepicker (because it 
renders the javascript references using components) to a modal dialog.

-Matej

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