code: public void setHref(String href)
      {
          ExtendedInfo info = getInfo(href);
          if (info != null)
              info._href = href;
      }
docs: Set the hyperlink which will be called when the node is selected.   A tree node may only have
  a <code>action</code> or <code>href</code> or <code>clientAction</code> set but not both.
  @param href The hyperlink called when the node is selected.