Bug 267242 [JFace] Add API to configure table and tree columns in a keyboard-accessible way
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetPage.java
public void partActivated(IWorkbenchPart part) {
		}
		public void partBroughtToTop(IWorkbenchPart part) {
		}
		public void partClosed(IWorkbenchPart part) {
			if (sourcePart == part) {
				if (sourcePart != null)
					sourcePart.getSite().getPage().removePartListener(partListener);
				sourcePart = null;
				if (viewer != null && !viewer.getControl().isDisposed()) {