The column index (0 based).
The number parent the group have.
Optional
descriptionThe tooltip text shown when the column header name is truncated.
The column fields included in the group (including nested ones).
A unique string identifying the group.
Optional
headerThe title displayed in the column header cell.
Indicate if the group is the last one for the given depth.
The maximal depth among visible columns.
Object passed as parameter in the column group header renderer.