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GridViewDataControlGroupRowIsExpandedChanging Event
Occurs when a group row's expanded state is about to be changed.

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<GroupRowCancelEventArgs> GroupRowIsExpandedChanging

Value

Type: SystemEventHandlerGroupRowCancelEventArgs
See Also