A parent widget is one level above all of its children in the widget hierarchy and contains its child widgets. A parent widget can be a level-0 widget, but is not necessarily one. When a parent widget is a level-0 widget, it has the same properties as a level-0 widget.
A widget becomes a parent when you assign child widgets to it using the PARENT option in the child widgets' ASSIGN statements. A widget can be both a parent and child widget at the same time.
