onAfterSorting

fires exactly after sorting has occured in the grid

void onAfterSorting(number index,string type,string direction);

index	number	the index of a column
type	string	the sorting type("str","int","date")
direction	string	the direction of sorting ("asc","des")

Available only in PRO Edition

grid.attachEvent("onAfterSorting", function(index,type,direction){
    //your code here
});