undefined' || listItem === null) {
                    return;
                }
                if (listItem.FSObjType == 0) {
                    calloutActionMenu.addAction(new CalloutAction({
                        text: Strings.STS.L_CalloutFollowAction,
                        tooltip: Strings.STS.L_CalloutFollowAction_Tooltip,
                        onClickCallback: function (calloutActionClickEvent, calloutAction) {
                            var callout = GetCalloutFromRenderCtx(renderCt