When I setup the PopulationDataSourceSettings on a combo box, I am trying to use a FillAll function which return the count of records in the BO after the fill.  I dont care about the return value when filling the combo, but I still want to use the FillAll function to fill it.  However, it's not available in the Method to Execute dropdown unless it's a Sub.  Is there anything that can be done about this or some reason it is like this that I'm not understanding?

I don't use the GAC for my assemblies, so I don't think that's the issue.  The function was definitely Public, not Private.  That was the first thing I checked.  I built, rebuilt, closed VS and opened it back about 3 or 4 times just to be sure I wasn't crazy.  It never showed up in the dropdown.  Then I just changed it from a Function to a Sub, built my BO library, and presto, it showed up in the dropdown.

When it was a Function did it have a return value?  If not that could have prevented it from appearing.  At any rate, glad you got it working!