I'm having a little trouble calculating column totals in a grouped grid. I've started from the sample code in http://devcenter.infragistics.com/Support/KnowledgeBaseArticle.aspx?ArticleID=3467, and I can calculate row totals fine. Here is the code I'm using in the AfterExitEditMode handler:

 function UltraWebGrid1_AfterExitEditModeHandler(gridName, cellId){
    try {
        var cell = igtbl_getCellById(cellId);
        var row = cell.getRow();
       
        // update row and column totals

        // snip... row totals are fine
       
        // deal with column totals
        if(row.ParentRow.GroupByRow) {
            // ParentRow is the group row, get child rows (ie rows in this group)
            var rows = row.ParentRow.getChildRows();
            // get column to update
            var column = cell.Column;
            var colTotal = 0;
            for(var i = 0; i < rows.length; i++) {
                colTotal += parseFloat(row.ParentRow.getChildRow(i).getCellByColumn(column).getValue());
            }
            alert(colTotal);
            // place value in column footer
            // snip... I'll worry about this later
        }
    } catch(ex) {
        alert(ex.message);
    }
}

The problem is that row.ParentRow.getChildRow(i) returns null. I have also tried rows.getRow(i) - but the rows collection, while it is a collection and has the right length, doesn't even have a getRow method. I have also tried row.ParentRow.FirstChild, which also returns null.

Anybody know how to do this?