code: public static AjaxOperation registerComponent(final String targetId, final String triggerId) {
  		AjaxOperation operation = new AjaxOperation(triggerId, targetId);
  		registerAjaxOperation(operation);
  		return operation;
  	}
docs: Registers a single component as being AJAX capable.
  
  @param targetId the component to register. The component will be re-painted when the trigger occurs.
  @param triggerId the id of the trigger that will cause the component to be painted.
  @return the AjaxOperation control configuration object.