Bug 27530 [Properties view] CopyPropertyAction does not dispose clipboard
build I20021127 CopyPropertyAction allocates a Clipboard but does not dipose it. Should add a dispose method here, and call it from PropertySheetPage.dispose().
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/properties/PropertySheetPage.java
/* (non-Javadoc)
	 * Method declared on <code>IPage</code>.
	 */
	public void createControl(Composite parent) {
		
		viewer = new PropertySheetViewer(parent);
		
		if (rootEntry == null) {
			
			PropertySheetEntry root = new PropertySheetEntry();
			if (provider != null)
				
				root.setPropertySourceProvider(provider);
			rootEntry = root;
		}
		viewer.setRootEntry(rootEntry);
		viewer.addActivationListener(getCellEditorActivationListener());
		
		viewer.addSelectionChangedListener(new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				handleEntrySelection((IStructuredSelection) event.getSelection());
			}
		});
		initDragAndDrop();
		makeActions();
		
		
		MenuManager menuMgr = new MenuManager("#PopupMenu"); 
		menuMgr.add(copyAction);
		menuMgr.add(new Separator());