Bug 263413 [DataBinding] Widget<Value|List>Property and Viewer<Value|Set|List>Property should be public
The base Widget*Property and Viewer*Property perform some standard stuff like defaulting the realm to the display realm of the widget, and wrapping the observable in an ISWTObservable or IViewerObservable decorator. In addition, WidgetValueProperty implements listeners using SWT's untyped listener API. We should make these classes public so that downstream projects like Nebula can consume them.
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/viewers/ViewerListProperty.java
public IObservableList observe(Object source) {
		if (source instanceof Viewer) {
			return observe(SWTObservables.getRealm(((Viewer) source)
					.getControl().getDisplay()), source);
		}
		return super.observe(source);
	}
	public IObservableList observe(Realm realm, Object source) {
		IObservableList observable = super.observe(realm, source);
		if (source instanceof Viewer)
			observable = new ViewerObservableListDecorator(observable,
					(Viewer) source);
		return observable;
	}
}