code: public Map<String, Boolean> getIsActive() {
  
          if (m_isActive == null) {
              m_isActive = CmsCollectionsGenericWrapper.createLazyMap(new CmsIsActiveTransformer());
          }
          return m_isActive;
      }
docs: Returns a lazy initialized Map that provides Booleans that
  indicate if a given navigation uri is currently active.<p>
  
  The provided Map key is assumed to be a String that represents an absolute VFS path.<p>
  
  Usage example on a JSP with the JSTL:<pre>
  &lt;cms:navigation  type="treeForFolder" startLevel="1" endLevel="3" var="nav" /&gt;
  &lt;c:forEach var="entry" items="${nav.items}" ... &gt;
  ...
  &lt;c:if test="${nav.isActive[entry.resourceName]}" &gt;
  This is the currently active navigation entry
  &lt;/c:if&gt;
  &lt;/c:forEach&gt;</pre>
  
  @return a lazy initialized Map that provides Booleans that
  indicate if a given navigation uri is currently active