code: public String buildCheckboxEnableNotification() {
  
          String propVal = null;
          if (!isMultiOperation()) {
              // get current settings for single resource dialog
              try {
                  propVal = getCms().readPropertyObject(
                      getParamResource(),
                      CmsPropertyDefinition.PROPERTY_ENABLE_NOTIFICATION,
                      false).getValue();
              } catch (CmsException e) {
                  if (LOG.isInfoEnabled()) {
                      LOG.info(e.getLocalizedMessage());
                  }
              }
  
          }
          if (CmsStringUtil.isEmpty(propVal)) {
              propVal = CmsStringUtil.FALSE;
          }
          StringBuffer result = new StringBuffer(512);
          result.append("<input type=\"checkbox\" style=\"text-align:left\" name=\"");
          result.append(PARAM_ENABLE_NOTIFICATION);
          if (Boolean.valueOf(propVal).booleanValue()) {
              result.append("\" checked=\"checked");
          }
          result.append("\" value=\"true\">");
          return result.toString();
      }
docs: Creates the check box to enable content notification for a resource.<p>
  
  @return HTML code for the enable_notification check box.