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/swt/ControlStringListProperty.java
public Object getElementType() {
		return String.class;
	}
	protected void doSetList(Object source, List list, ListDiff diff) {
		String[] strings = (String[]) list.toArray(new String[list.size()]);
		doSetStringList((Control) source, strings, diff);
	}
	abstract void doSetStringList(Control control, String[] list, ListDiff diff);
	protected List doGetList(Object source) {
		String[] list = doGetStringList((Control) source);
		return Arrays.asList(list);
	}
	abstract String[] doGetStringList(Control control);
	public INativePropertyListener adaptListener(
			ISimplePropertyListener listener) {
		return null;
	}
	public void doAddListener(Object source, INativePropertyListener listener) {
	}
	public void doRemoveListener(Object source, INativePropertyListener listener) {
	}
}