code: protected String computeUpLevelLink() {
  
          String parentPath = getParentPath();
          String rootKey = getToolManager().getCurrentRoot(this).getKey();
          CmsTool parentTool = getToolManager().resolveAdminTool(rootKey, parentPath);
          String upLevelLink = null;
          if (parentTool != null) {
              upLevelLink = CmsToolManager.linkForToolPath(
                  getJsp(),
                  parentPath,
                  parentTool.getHandler().getParameters(this));
              upLevelLink = CmsRequestUtil.appendParameter(upLevelLink, PARAM_FORCE, Boolean.TRUE.toString());
          }
          return upLevelLink;
      }
docs: Creates the link for the 'up' button.<p>
  
  @return the link for the 'up' button