code: public List<CmsGroup> getChildren(String groupname, boolean includeSubChildren) throws CmsException {
  
          return m_securityManager.getChildren(m_context, groupname, includeSubChildren);
      }
docs: Returns all child groups of a group.<p>
  
  @param groupname the name of the group
  @param includeSubChildren if set also returns all sub-child groups of the given group
  
  @return a list of all child <code>{@link CmsGroup}</code> objects or <code>null</code>
  
  @throws CmsException if operation was not successful