MSG_FILE_PREV
_SendMessageToWindow(MSG_FILE_PREV);
_SendMessageToWindow(MSG_FILE_PREV);
_SendMessageToWindow(MSG_FILE_PREV);
fToolBar->AddAction(MSG_FILE_PREV, this,
MSG_FILE_PREV, B_UP_ARROW, 0, this);
_EnableMenuItem(fBar, MSG_FILE_PREV, false);
case MSG_FILE_PREV: