currentPicture = new PicturesContent();
pictures.add(currentPicture);
receivers = Collections.synchronizedList(new ArrayList<JID>());
backend = b;
HistoryPanel historyPanel = new HistoryPanel(this);
history = new PictureHistory(backend, historyPanel);
receivers.add(userName);
thread = t;
window = new PictureChatFrame(this, currentPicture, historyPanel);