SMART datagrid v.1 > Classes > ColumnGroup
If this column group is the group of including column by parameter or one of the upper groups, it will return true.
var index = grid.getCurrent();
if (index && index.column()) {
var group = grid.columnByName('group1');
var col = index.column();
if (group.isAncestorOf(col)) {
col.styles().setBackground('#10330000');
}
}