if (fileTransferOpSet != null)
{
fileTransferOpSet.removeFileTransferListener(getContactListPanel());
}
OperationSetMessageWaiting messageWaiting
= protocolProvider.getOperationSet(OperationSetMessageWaiting.class);
if (messageWaiting != null)
{
messageWaiting.removeMessageWaitingNotificationListener(
MessageType.VOICE,
TreeContactList.getNotificationContactSource());
}
}