ID_VALID_UNTIL
SendMessage(mainwin, WM_COMMAND, MAKEWPARAM(ID_VALID_UNTIL, 1), 0);
{"Valid Until", true, ID_VALID_UNTIL, 100}, // VALID_UNTIL
ON_COMMAND(ID_VALID_UNTIL, OnValidUntil)
ON_UPDATE_COMMAND_UI(ID_VALID_UNTIL, OnUpdateValidUntil)