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Object-oriented Programming in C#
Abstract classes, Interfaces, and Patterns
A Composite Example: A GUI

The classes of a Graphical User Interface (GUI) make up a Composite design pattern

/user/normark/oop-csharp-1/sources/c-sharp/windows-forms/CompositeDemo.csA program that builds a sample composite graphical user interface.

A Form (Window) with two buttons, a textbox, and a panel.