docs: public String buttonActionCancel() {
  
          String target = null;
          if (Boolean.valueOf(getParamDirectedit()).booleanValue()) {
              // editor is in direct edit mode
              if (CmsStringUtil.isNotEmpty(getParamBacklink())) {
                  // set link to the specified back link target
                  target = getParamBacklink();
              } else {
                  // set link to the edited resource
                  target = getParamResource();
              }
          } else {
              // in workplace mode, show explorer view
              target = CmsVaadinUtils.getWorkplaceLink();
          }
          return "onclick=\"top.location.href='" + getJsp().link(target) + "';\"";
      }