SMART datagrid v.1 > Classes > CellIndex
If the column corresponding to the cell of this location is column group, it will be Column Group object, else will be null.
The columns which are not column group all inherit ValueColumn, and can be known by valueColumn property.
$('#expand').click(function () {
var group = grid.focusedIndex().group();
if (group) {
group.expand();
}
});