Replacing baseclasses

  Truly simple question! How to replace (fully or partially automatic) the baseclasses of the container objects
(derived immediately from baseclasses) with custom ones stored in custom library, preserving
nonherited properties and methods. Names of the new classes should be somewhat convertible from
those original (i.e. baseclasses'names) to avoid confusion and VFP not rejected them.
  Any hint will be highly appreciated.

  Janusz Malinowski