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The "binding property" is a property that can be bound to a property of another bean. The binding property can correspond to a regular bean property, but can also be a synthetic one (e.g. provided by some property delegate; for example elements property of JTable). The property sheet in the GUI builder will contain a new Binding section that will show the binding properties. These properties will have a special customizer that will allow you to specify the binding.
Implemented.