SMART datagrid v.1 > Classes > ColumnGroup
Return Column object on the left side of column specified by parameter. If it is the column not being included or displayed in this group, or it is the first column, it will return null.
var idx = grid.focusedIndex();
var col = idx.column();
if (col && col.group()) {
col = col.group().left();
if (col) {
grid.setFocusedIndex(grid.getIndex(idx.I(), col);
}
}