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CheckMenuItem       Add or remove checkmark at pop-up menu item

BOOL CheckMenuItem(hMenu, wIDCheckItem, wCheck)
HMENU hMenu;
WORD wIDCheckItem; /* Menu item ID or position */
WORD wCheck;


wCheck:         MF_BYCOMMAND or MF_BYPOSITION or'd with
                MF_CHECKED or MF_UNCHECKED

Returns:    Previous MF_CHECKED or MF_UNCHECKED.