Message Box, Yes, No & Cancel

[m0tSiE]

Hi,

I' using the following code to show a Yes, No or Cancel box,

Code:

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What Severity is this?
str sev
if mes("Is the keyboard still usable?" "Question" "YN?") == 'Y'
    sev="yes"
else
    sev="no"

...however I want to now add a Cancel option.

I know I add C to do this, i.e. YNC, however, how can I set it so if Cancel is pressed it will stop the macro using ret?

Thanks,

Paul.