src/main/java/org/efaps/ui/wicket/behaviors/AjaxFieldUpdateBehavior.java
@Override
    public void renderHead(final Component _component,
                           final IHeaderResponse _response)
    {
        super.renderHead(_component, _response);
        _response.render(AbstractEFapsHeaderItem.forJavaScript(AjaxFieldUpdateBehavior.JS));
    }
@Override
    public void renderHead(final Component _component,
                           final IHeaderResponse _response)
    {
        super.renderHead(_component, _response);
        _response.render(AbstractEFapsHeaderItem.forJavaScript(AjaxFieldUpdateBehavior.JS));
    }
Render to the web response the eFapsContentReference.

@param _response Response object