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/StructuredViewerFiltersProperty.java
public Object getElementType() {
		return ViewerFilter.class;
	}
	protected Set doGetSet(Object source) {
		return new HashSet(Arrays.asList(((StructuredViewer) source)
				.getFilters()));
	}
	public void doSetSet(Object source, Set set, SetDiff diff) {
		StructuredViewer viewer = (StructuredViewer) source;
		viewer.getControl().setRedraw(false);
		try {
			viewer.setFilters((ViewerFilter[]) set.toArray(new ViewerFilter[set
					.size()]));
		} finally {
			viewer.getControl().setRedraw(true);
		}
	}
	public INativePropertyListener adaptListener(
			ISimplePropertyListener listener) {
		return null;
	}
	public void doAddListener(Object source, INativePropertyListener listener) {
	}
	public void doRemoveListener(Object source, INativePropertyListener listener) {
	}
	public String toString() {
		return "StructuredViewer.filters{} <ViewerFilter>"; 
	}
}