Problem calling defaults properties from VB6 (¿bug?)

[Tako]

I have a problem calling .NET classes with default properties from VB6.

The class has a public member, this public member has a default
property, from VB6 I can´t acces the default method without especifi the
name of the defaul method, if I do it I get this error: 450: Wrong number of
arguments or
invalid property assignment

Example:

Public Class c2
Private _number As Integer

Default Public Property defaultP(ByVal index As Integer) As Integer
Get
Return index
End Get
Set(ByVal Value As Integer)
_number = Value
End Set
End Property

Public Function hello() As Integer
Return _number
End Function
End Class

Public Class c1
Public c As New c1
End Class
This is VB6

Dim a As Object
Set a = CreateObject("Clase.c1")

a.c.defaultP(9) = 5 'OK
MsgBox a.c.hello()

a.c(9) = 6 'error 450
MsgBox a.hello()