OnChangeAjaxBehavior can render javascript before wicket-ajax.js is loaded

In the current OnChangeAjaxBehavior implementation, the behavior renders javascript (Wicket.ChangeHandler)
within the onComponentRendered() method directly to the response. Its okay in case, when wicket-ajax.js is rendered in the head of the page, but if we move javascript to the footer of the page, the inlined javascript will be broken.

I think, the javascript have to be evaluated after the DOM is built.