automating excel: Can't get the add-in work in excel

[Maximus]

Hi all,

I'm newbie to C# (I'm a Java developer) and I wonder if anyone can assist on
this one.

I'm trying to implement an add-in to excel. I tried the example given at:
http://blogs.msdn.com/eric_carter/archive/2004/12/01/273127.aspx

all worked well but one minor issue: I can't get this -
AutomationAddin.MyFunction on the insert Function Dialog.
* yes, I have it in my add-ins list just as the tutorial explains but not in
the 'Insert Function' dialog.

does anyone know why and how can I solve it.
Thank you!