Query on sort behavior

the issue I am facing is, after I sort the grid data (by clicking column header), if I select row it does not return the correct selected row index in term of actual data (array index) set to the grid.

say if set following data to grid:
var myData = [
["C", "aa", "4313"],
["A", "bb", "5313"],
["B", "cc", "1313"],
["D", "dd", "3313"]
];

So, grid contain following column value for first column:
C
A
B
D

After sorting column based on first column, it shows:
A
B
C
D

Now if I click of 3rd row, the obj.onCellClicked prompt me value "0" (which is actually pointing that 'C' was at 0h index of array).
obj.onCellClicked = function(event, col, row){
alert("Row selected: " + row);
};

My requirement is it should return me "3" as this is now 3rd row.

How this can be done.

I tried following:

obj.onRowIndicesChanged = function(value){
var innerArr = new Array();
var temp = new Array();
for(i=0;i<value.length;i++) {
var arrIndex = value[i];
temp.push(i);
innerArr.push(myData[arrIndex]);
}
myData=innerArr;
obj.clearScrollModel();
obj.clearSelectedModel();
obj.clearSortModel();
obj.clearRowModel();
obj.setRowCount(myData.length);
obj.setCellText(myData);
obj.refresh();
};

the issue with this is, after this function exits, the row position displayed are not correct. It shows
3
1
2
4

it is correct after obj.refresh (if I put alert after obj.refresh(), at that time it shows correct order). as soon as I click OK on alert, row serial number becomes incorrect.

please let me know how to resolve this issue