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Hello LAVA members, I just received my CLA results... and I passed! This was my first attempt and I really appreciate all the good informations I found here Take care!

Jack: After working through your thread, I think the answer you are looking for is what would be called template classes in C++ and generic classes in C#. There you would define the ancestor class in terms of type T -- not any specific type, but an unnamed type T. Think like the Queue primitives. You have many different types of queues: queues of strings, queues of integers, etc. All of them need a "copy data into the queue" operation. Obviously that cannot be defined by the parent "queue" class. And it cannot be by dynamic dispatch because, as you point out in your examples, every child has a different interface for this operation. The templating/generics takes care of that. An entirely new class is instantiated by the compiler by supplying a concrete type to fill in for type T. R&D prototyped but never released generic VIs (loathe the name because the terminology is way too overloaded, but I'll use it for now). We need a way that you would put a placeholder in the private data control and then in your project specify "I am using a new class which is the same as my generic class but with that placeholder filled in with <your specific type here>". Templates/generics have proved quite powerful in various languages, but they generally come with the need for an ultrasmart linker that can, at load time, only create one copy in memory of the specific concrete classes, even when multiple modules join together, each one of which may have instantiated the same concrete class. They also want to only duplicate the specific methods that use type T's internals and not duplicate any methods that just refer to type T in a way that all the assembly code generated is identical (i.e. T just passes through them but is not itself modified). That addresses ShaunR's memory concerns. Without such smart linkers, templates will bloat your code very very very quickly. I assume if we ever get this feature in LV that we will have learned from the other languages that have it and build the linker capacities in from the outset.

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One of the flags (mods) of the Mouse Down event is 'Double Click': Ton