Handle this event to provide your own custom navigation when the popup is opened. Receives the key that was pressed and the current index, and returns the new index that should be selected.

'Declaration
 
Public Event KeyDownInPopup As System.Func(Of Key,Integer,Integer)

'Usage
 
Dim instance As C1ComboBox
Dim handler As System.Func(Of Key,Integer,Integer)
 
AddHandler instance.KeyDownInPopup, handler

public event System.Func<Key,int,int> KeyDownInPopup