Centre - %cn
%cn forces the text and controls that follow (up to the next %nl or %ff) to be
centred in the window (or box). It is often used in conjunction with buttons.
i=winio@('%cn%si!Save current changes?%2nl&')
i=winio@('%tt[Yes] %tt[No] %tt[Cancel]')
The %cn format code can take a grave accent format modifier. This causes
centring to apply to the remainder of the format window or box. Thus a whole
window or a box full of centred items may be created very easily.
i=winio@('%`cnProgram to test prime numbers&')
i=winio@('%2nlWritten by Joe Bloggs%2nl%`bt[OK]')
If %cn is used within a box then it centres objects within that box.