Using inheritance to build a window – PB Docs 2017

When you build a window that inherits its definition—its style,
events, functions, structures, variables, controls, and scripts—from an
existing window, you save coding time. All you have to do is modify the
inherited definition to meet the requirements of the current
situation.

This section provides an overview of using inheritance in the
Window painter. The issues concerning inheritance with windows are the
same as the issues concerning inheritance with user objects and menus.
They are described in more detail in Understanding
Inheritance.