Another case I had with a previous client. One form with option group for type of input (can't remember exactly what but somewhat generic). Select an option button and input screen changes slightly. Base form had option group and save/cancel buttons. Three classes (one for each input container). Option group selection added object and named it same regardless. This worked wonderfully. Subclassing the form three times would have been overkill. AddObject was the perfect choice.

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>One of the cases for AddObject() is assembling the composite classes when it is instantiated. Say, I develop the container class with other classes in it. It makes the development process much easier if I assemble this container with AddObject() in container.Init(). This way in the development process I can have all necessary classes opened with the Class Designer simutaneousely, avoiding the error message "Class .... is in use by MODIFY CLASS"