    ItemID.

  ,     ID   .  ,      -     .       !      ,  , 1, 2  3,       ,  ,  ? !        .  .  .
      .

 ,   .     ,      ,    10-20  ,   WM_COMMAND   ,     .     MessageCatcher   ,    .
    Show    !  Show    ,        .        .

  .    ,   GetMenuItemID  -1.   ID      GetMenuItemInfo,  tmpInfo.fMask = MIIM_ID.    GetMenuItemID   .