class EventFilterForMessageList(QObject):
      def __init__(self):
            QObject.__init__(self)
            
      def eventFilter(self, CurrentObject, CurrentEvent):
            CurrentType = int(CurrentEvent.type())
            if CurrentType != (QEvent.User + 1):
                  return False

#СЮДА НИКОГДА НЕ ЗАХОДИТ !!!
            Index = CurrentObject.count();
            CurrentObject.insertItem(Index, CurrentEvent.Message);
            Item = CurrentObject.item(Index);
            
            #set message
            Item.setText(CurrentEvent.Message);
           
            #set icon
            Icon  = QStyle.QIcon(QApplication.style().standardIcon(CurrentEvent.TypeIcon));
            Item.setIcon(Icon);
            
            return True;

Filter = Events.EventFilterForMessageList()
EventReceiver = self.ui.MessageList;
EventReceiver.installEventFilter(Filter);

class EventForMessageList(QEvent):
      def __init__(self, Message_, TypeIcon_):
            QEvent.__init__(self, QEvent.User+1)
            self.Message = Message_;
            self.TypeIcon= TypeIcon_;

def MessageEvent(Information, TypeIcon, ImmediatelySend=True):
      NewEvent = EventForMessageList(Information, TypeIcon);

      if ImmediatelySend:
            QApplication.sendEvent(GV.EventReceiver, NewEvent);
      else:
            QCoreApplication.postEvent(GV.EventReceiver, NewEvent, -1); #-1 Qt.LowEventPriority