Automated add-in UDF lookup in Excel 2007
 

I have a automated add-in written in C# with a number of UDF's that runs
just fine in Excel 2007

However when I start to type a function name in a cell, Excel only look for
the build in functions.
How to I include my UDF's in the Excel look up so the user does not have to
type the full path to my UDF's?

Thanks Torben