property OleEvent.Param (Item as Variant) as OleEventParam
Retrieves an OleEventParam object given either the index of the parameter, or its name.

TypeDescription
Item as Variant A long expression that indicates the argument's index or a a string expression that indicates the argument's name.
OleEventParam An OleEventParam object that contains the name and the value for the argument.
The following sample shows how to enumerate the arguments of an OLE event: 
Private Sub XMLGrid1_UserEditorOleEvent(ByVal Object As Object, ByVal Ev As EXMLGRIDLibCtl.IOleEvent, CloseEditor As Boolean, ByVal Node As EXMLGRIDLibCtl.INode)
    Debug.Print "Event name:" & Ev.Name
    If (Ev.CountParam = 0) Then
       Debug.Print "The event has no arguments."
    Else
       Debug.Print "The event has the following arguments:"
       Dim i As Long
       For i = 0 To Ev.CountParam - 1
          Debug.Print Ev(i).Name; " = " & Ev(i).Value
       Next
    End If
End Sub