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TreeViewControl.NodeExpanding Event

Occurs before a node is expanded.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v22.1.dll


public event TreeViewNodeAllowEventHandler NodeExpanding

Event Data

The NodeExpanding event's data class is DevExpress.Xpf.Grid.TreeList.TreeViewNodeAllowEventArgs.


This event occurs when a user tries to expand a node. You can handle this event to cancel the action. To do this, set the event parameter’s TreeListNodeAllowEventArgs.Allow property to false.

After a user expands a node, the TreeViewControl raises the NodeExpanded event.

See Also