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RadGridViewGroupExpanding Event
Fires when the DataGroup is expanding or collapsing. This behavior is valid when grouping or hierarchy mode is applied.

Namespace: Telerik.WinControls.UI
Assembly: Telerik.WinControls.GridView (in Telerik.WinControls.GridView.dll) Version: 2018.2.619.40 (2018.2.619.40)
Syntax
[BrowsableAttribute(true)]
public event GroupExpandingEventHandler GroupExpanding

Value

Type: Telerik.WinControls.UIGroupExpandingEventHandler
See Also