About inheritance
One of the most powerful features of PowerBuilder is inheritance.
It enables you to build windows, user objects, and menus that are
derived from existing objects.
Using inheritance has a number of advantages:
- When you change an ancestor object,
the changes are reflected in all the descendants. You do not have
to make manual changes in the descendants as you would in a copy.
This saves you coding time and makes the application easier to maintain. - The descendant inherits the ancestor’s
scripts so you do not have to re-enter the code to add to the script. - You get consistency in the code and objects in your
applications.
This chapter describes how inheritance works in PowerBuilder and
how to use it to maximize your productivity.
Opening ancestors and descendants To enforce consistency, PowerBuilder does not let you open
an ancestor object until you have closed any descendants that are
open, or open a descendent object when its ancestor is open.
Document get from Powerbuilder help
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