code: private static void registerAjaxOperation(final AjaxOperation operation) {
  		UIContext uic = UIContextHolder.getCurrentPrimaryUIContext();
  		if (uic == null) {
  			throw new SystemException("No User Context Available to Register AJAX Operations.");
  		}
  		Map<String, AjaxOperation> operations = (Map<String, AjaxOperation>) uic.getFwkAttribute(AJAX_OPERATIONS_SESSION_KEY);
  		if (operations == null) {
  			operations = new HashMap<>();
  			uic.setFwkAttribute(AJAX_OPERATIONS_SESSION_KEY, operations);
  		}
  		operations.put(operation.getTriggerId(), operation);
  	}
docs: The Ajax servlet needs access to the AjaxOperation Store the operation in the user context using the trigger Id,
  as this will be present in the Servlet HttpRequest. agreed key. The ajax id is passed in the url to the servlet
  so it can then access the context.
  
  @param operation the operation to register.