Expanding and Collapsing Group Rows
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End-users can expand or collapse group rows by clicking group buttons via mouse.
#Expanding Group Rows in Code
To expand a group row, use the GridControl.ExpandGroupRow method. A group row is specified by its handle. To expand the focused group row, use the GridViewBase.ExpandFocusedRow method. All group rows can be expanded using the GridControl.ExpandAllGroups method.
Before a group row is expanded, a 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, a GridControl.GroupRowExpanded event is raised.
To identity whether a group row is expanded or not, use the GridControl.IsGroupRowExpanded method.
#Example: How to Prevent Group Rows from being Expanded
#Collapsing Group Rows in Code
To collapse a specified group row, use the GridControl.CollapseGroupRow method. To collapse a focused group row, use the GridViewBase.CollapseFocusedRow method. All group rows can be collapsed using the GridControl.CollapseAllGroups method.
Before a group row is collapsed, a GridControl.GroupRowCollapsing event is raised, allowing you to cancel the action. After a group row has been collapsed, a GridControl.GroupRowCollapsed event is raised.