A simple example that illustrates establishing bindings programmatically, 
including a number of options such as validation and an array operator, and 
indexed accessor methods. A custom model object implements custom validation 
method.

Originally from `Cocoa Bindings Examples and Hints`__, converted to PyObjC by 
u.fiedler.

.. __: http://homepage.mac.com/mmalc/CocoaExamples/controllers.html