afaik abort is impossible, but if you would start to return 0 from callback
without preformimng any real action inside then i think it should finish 
quickly.

i didn't tried it, but maybe it would work - but i am not sure if it can't make
any unwanted reordering

or another possibility is to make your own sort routine and not use system one

Luc Le Blanc wrote:
> When the user launches a sort on the list display of 30,000 records, it may
take some time, even on a fast device like a T3 (like 10 seconds). I would like
to offer the possibility of interrupting that sort by simply tapping on the
"Please wait..." message. But even if I check for a screen tap with
EvtSysEventAvail in my comparison proc, how do I then abort the sort? Tips 
welcome.
>
>

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