arrayCollection sort compareFunction sometimes passes 3 parameters; sometimes 2

my sort comparefunction set this:

 

private var sort:sort = new sort();

sort.comparefunction = serverstatusarraysort;

sort.fields = null;
serverstatusarray.sort = sort;
serverstatusarray.refresh();

 

 

private function serverstatusarraysort(obj1:object , obj2:object):int{
           return objectutil.stringcompare(obj1 string, obj2 string, true);
  }

 

sometimes when call refresh, serverstatusarraysort function passed 3 parameters , other times passed 2. how can guarantee pass either 2 or 3?

your structure of sortfunction not proper...the structure of sortfunction this

 

function [name](a:object ,b:objec, fields:array=null):int

 

you find example of in link

 

http://books.google.com/books?id=7fbhb_glqeac&pg=pa399&lpg=pa399&dq=flex+3+arraycollection +sort+comparefunction+dates&source=bl&ots=hu_ibkqe_d&sig=psitgos96paf1o8i1ruh7nl2nla&hl=en &ei=6knpstsgeijkna3e8c8m&sa=x&oi=book_result&ct=result&resnum=9#v=onepage&q&f=false

 

if post answers question or helps, please kindly mark such.

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