I have a need to add a couple of properties and an interface to all my
controls.  ATM I'm creating descendants and adding then to each class, but
it would be much neater to insert a new ancestor containing the properties
between TWinControl and TGraphicControl and TControl.

On a first attempt I ran into so much co-linkage through the standard
classes that I gave up the idea. However I would be interested to hear of
anyone who has done something similar or has some pointers on ways, means
and traps.

TIA

Stephen 

  
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