code: @Override
      public void renderHead(final Component _component,
                             final IHeaderResponse _response)
      {
          super.renderHead(_component, _response);
          _response.render(new PriorityHeaderItem(new DojoHeaderItem(AbstractDojoBehavior.JS_DOJO,
                          AbstractDojoBehavior.class.getName())));
          final String clazz = Configuration.getAttribute(ConfigAttribute.DOJO_CLASS);
  
          ResourceReference reference = null;
          if ("tundra".equals(clazz)) {
              reference = AbstractDojoBehavior.CSS_TUNDRA;
          } else if ("claro".equals(clazz)) {
              reference = AbstractDojoBehavior.CSS_CLARO;
          } else if ("nihilo".equals(clazz)) {
              reference = AbstractDojoBehavior.CSS_NIHILO;
          } else if ("soria".equals(clazz)) {
              reference = AbstractDojoBehavior.CSS_TUNDRA;
          }
          if (reference != null) {
              _response.render(CssHeaderItem.forReference(reference));
          }
      }
docs: Render the links for the head.
  
  @see org.apache.wicket.behavior.AbstractBehavior#renderHead(org.apache.wicket.markup.html.IHeaderResponse)
  @param _component component the header will be rendered for
  @param _response resonse to add