MSG_FILE_NEXT
_SendMessageToWindow(MSG_FILE_NEXT);
_SendMessageToWindow(MSG_FILE_NEXT);
fToolBar->AddAction(MSG_FILE_NEXT, this, tool_bar_icon(kIconGoNext),
MSG_FILE_NEXT, B_DOWN_ARROW, 0, this);
_EnableMenuItem(fBar, MSG_FILE_NEXT, false);
case MSG_FILE_NEXT: