public delegate void BeforeExpandEventHandler( object sender, BeforeExpandEventArgs e );
Public Delegate Sub BeforeExpandEventHandler( sender As Object, e As BeforeExpandEventArgs )
The event source.
A BeforeExpandEventArgs class instance containing event data.
When you create a BeforeExpandEventHandler delegate, you identify a method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information on event handler delegates, see Events and Delegates in MSDN.