DUN TNA-icon doesn't show


I use RAS functions to dial DUNs (already existing or creating them myself).
Everything works as expected, but under NT4 I can't see the little icon in
the TNA that usually shows me that a connection is active.

If I dial the DUN manually, the icon appears, but if I use RasDial(...) it

What option or flag must I use?

Thanks in advance