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Returns the class group to which an instance or class belongs
Source position: classesh.inc line 2230
function ClassGroupOf(  | 
AClass: TPersistentClass  | 
):TPersistentClass;  | 
Instance: TPersistent  | 
ClassGroupOf returns the class group to which AClass or Instance belongs.
The result is Nil if no matching class group is found.
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Start new class group.  | 
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Activates a class group  | 
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Provided for Delphi compatibility  |