import mx.collections.Sort;
import mx.utils.ObjectUtil;
private function handleSort():void
{
var sort:Sort = new Sort();
sort.compareFunction = sortFunction;
collection.sort = sort;
collection.refresh();
}
private function sortFunction( a:Object, b:Object, fields:Array = null ):Boolean
{
var dateA:Date = new Date( Date.parse( a.dob ) );
var dateB:Date = new Date( Date.parse( b.dob ) );
return ObjectUtil.dateCompare( dateA, dateB );
}