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I'm trying to extend functionality of the VBA Collection object in a new class and make this class an inheritant of Collection , but the Implements Collection statement gives me the following error: Bad interface for Implements: method has underscore in its name. What underscore?! Add , Item , Remove , and Count are the only methods listed in the documentation for Collection . All four are underscore-free. EDIT : To clarify, I'm making a class called UniformCollection (that only accepts members that are all of the same type, inspired by this approach ). I'd like it to implement Collection , so that a UniformCollection is a Collection and can be used in place of a Collection when calling other objects' methods, etc. I know I have to write delegating methods/properties for Add, Item, etc., and a NewEnum property for For Each to work, and I've done so already. My problem is that the Implements Collection statement gives me the error stated above. Bonus question : is Count a method or a property of Collection ? Help calls it a property, but the Object Browser in the VBA editor calls it a function i.e. method (flying yellow box).

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