Hi,

>>   What I actually have in mind is FishEyeMorph (I wrote) and
>> MagnifierMorph (Bert wrote).  While it seems (to me, for
>> now) natural to put the FishEyeMorph below the
>> MagnifierMorph, I don't want to use the menu items that
>> MagnifierMorph defines.
> 
> See... that's already a sign that either the inheritance
> is wrong.

  Probably yes.  What I was trying to was creating a
subclass that doesn't respond to some methods defined in its
superclass.  This means that the subclass is not compatible
with the superclass.  In general, this is what supposed to
do.

  -- Yoshiki