'Declaration
 
Public Delegate Sub GroupExpansionChangingEventHandler( _
   ByVal sender As Object, _
   ByVal e As GroupExpansionChangingEventArgs _
) 

'Usage
 
Dim instance As New GroupExpansionChangingEventHandler(AddressOf HandlerMethod)

public delegate void GroupExpansionChangingEventHandler( 
   object sender,
   GroupExpansionChangingEventArgs e
)

Parameters

sender

e

Target Platforms: Windows 11, Windows 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

GroupExpansionChangingEventHandler Members
Xceed.Wpf.DataGrid Namespace