I need some kind of copyTo: functionality, which copies a complete object (i.e. all instance variables) to another object. I need this to "convert" an object of class A into an object of a subclass of A. Something like:

MyClass subclass: #MySubcl
instanceVariableNames: 'var3' ...

MySubcl class >> newCopyFrom: original

"create an object of class MySubcl with is - as MyClass - identical to original"

An example of such a functionality is FormCanvas asBalloonCanvas. This method is implemented by creating a BalloonCanvas and initializing it "by hand". I am looking for a generic way - something like copy in Object. Any idea?

Thanks a lot

Rudi