A good convention for working with multiple subclasses is to only subclass the window procedure that is the first in the call chain and only unsubclass the one that is first.
Source: wiktionary
Unsubclass
Synonyms for "unsubclass"
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Sample sentences
3 total sentences available.
Unsubclassing the plug-in window ensures that Navigator can continue to function normally once the plug-in module is unloaded.
Source: wiktionary
It is very important to remember to unsubclass the plug-in window when the plug-in is destroyed.
Source: wiktionary