I have an object-oriented hierarchy of classes that I want to expose via COM
in a VB.NET 2005 project.  It all works fine except for this:

The client program that uses the COM object can't see the public properties
and methods of the base classes from which the COM classes are derived.

IOW: I have a class called MyBase that has a public property called LoginID
and a public method called Login().  And I have a class called MyCOMClass
which inherits MyBase and is also defined as a COM class (has GUIDs and all
that).  I am trying to call this COM object from a Progress program, and I
can see the MyCOMClass and all its public properties and methods, and I can
even see MyBase on the list of COM classes that gets displayed in the class
browser.  But I can't see the LoginID property nor the Login function -
neither under the MyCOMClass, nor even under the MyBase class.

Does anybody have an idea why this is?  Does COM not expose the members of
parent classes?