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GridViewDataControlRowIsExpandedChanging Event
Occurs when a row's expanded state is about to be changed - when its hierarchy child is expanded or collapsed.

Namespace: Telerik.Windows.Controls.GridView
Assembly: Telerik.Windows.Controls.GridView (in Telerik.Windows.Controls.GridView.dll) Version: 2017.3.913.40 (2017.3.913.40)
Syntax
public event EventHandler<RowCancelEventArgs> RowIsExpandedChanging

Value

Type: SystemEventHandlerRowCancelEventArgs
See Also