SMART datagrid v.1 > Classes > GroupRow
When summaryMode of GridBase.rowGroup is not NONE, it will return the maximum value by calculating the sum of field values specified by parameter field among data row of belonging to this group.
$('#getMax').click(function () {
var row = grid.focusedRow();
if (row instanceof GroupRow) {
var max = row.getMax(0);
$('#max').val(max);
}
});