SMART datagrid v.1 > Classes > CellIndex
If column is DataColumn and dataIndex of rowIndex row is greater than 0, it will return true.
$('#setValue').click(function () {
var cellIndex = grid.focusedIndex();
if (cellIndex.isDataCell()) {
var row = grid.getRow(cellIndex.rowIndex);
row.setValue(0, $('#value'));
}
});