Occurs before a group of items is expanded.
NuGet Package: DevExpress.Maui.CollectionView
public event EventHandler<CancelItemEventArgs> GroupExpanding
The GroupExpanding event's data class is CancelItemEventArgs. The following properties provide information specific to this event:
|Cancel||Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.|
|ItemHandle||Returns the handle of the processed item.|
The GroupExpanding event is raised before a group of data items is expanded from UI or code (ExpandGroup). You can handle this event and set its parameter’s Cancel inherited property to
true to prevent a group from being expanded.
When you call the ExpandAllGroups method, the GroupExpanding event is raised for each group.
After the group has been expanded, the GroupExpanded event is raised.