I quickly checked in Help but I can not see where you're quoting this from. May be you have a link?

Thanks.

Also without doing a research I agree with Cetin - EMPTY class is the only one that comes to mind as non-subclassable.

>I got this text below from MSDN - I'm having trouble understanding .."from most"..
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>Subclasses in Visual FoxPro
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>You can create a new class or a subclass from most of the Visual FoxPro base classes or other existing classes. A subclass can include some or all the functionality of the original, or parent, class, plus any additional characteristics, such as custom default properties, or functionality that you want to include to customize the new class.