removed = denManager.getSelectedEventParticipants(dateList, selection);
dateList = denManager.deleteParticipants(ores, courseNode, denManager.getSelectedEventIDs(dateList, selection));
listTableData.setObjects(dateList);
//send notification mail
createRemovedNotificationMail(ureq, dateList.get(0).getSubject());
} else if(tmse.getAction().equals(DENListTableDataModel.MAIL_ACTION) && selection.cardinality() > 0) {
//send email to all users from the selected dates
List<Identity> participants = denManager.getSelectedEventParticipants(dateList, selection);
createParticipantsMail(ureq, participants);
} else if(selection.cardinality() == 0) {
getWindowControl().setWarning(translate("participants.message.empty"));