Gets or sets a value specifying whether the current operation (group row expanding or collapsing) is allowed.
This documentation topic describes legacy technology. We no longer develop new functionality for the GridControl and suggest that you use the new DataGridView control instead.
The GroupRowExpanding event is raised before a group row is expanded by an end-user or in code, allowing you to cancel this action. To prevent a group row from being expanded, set the event parameter's Allow property to false.
The GridControl.ExpandAllGroups method allows you to expand all group rows. In this instance, the GroupRowExpanding event is raised for each group.