Message message = modes.getMessage();
KetPanel ketPanel = document.getKetPanel();
// box list: (BoxWord) start, (BoxWord) "|", (BoxWord) end
BoxList messageBox = ketPanel.getMessageBoxList();
if (messageBox==null) return false;
Box clickedOn = messageBox.findDeepestBox(p);
boolean messageBoxClick = clickedOn!=null;
if (!messageBoxClick) return false;
Vector<Box> children = messageBox.getChildren();
if (children.size()!=3) return false;
BoxWord startBoxWord = (BoxWord) children.get(0);