End-users can expand or collapse group rows by double-clicking them.
Before a group row is expanded, the GridControl.GroupRowExpanding event is raised, allowing you to cancel the action. For instance, you can prevent an end-user from expanding individual group rows. After a group row has been expanded, the GridControl.GroupRowExpanded event is raised.
To identity whether a group row is expanded, use the GridControl.IsGroupRowExpanded method.
Before a group row is collapsed, the GridControl.GroupRowCollapsing event is raised, allowing you to cancel the action. After a group row has been collapsed, the GridControl.GroupRowCollapsed event is raised.