Shows how to replace object selection dialog in a reference property editor

editorcustomization.java

	/**
	 * @generated NOT
	 */
	protected void addXXXPropertyDescriptor(Object object) {
		
		EMFEditUIPropertyEditorFactory editorFactory =  new EMFEditUIPropertyEditorFactory(null) {
			
			@Override
			public CellEditor createEditor(Object object, IItemPropertyDescriptor propertyDescriptor, Composite composite) {
	            ILabelProvider labelProvider = new org.eclipse.emf.edit.ui.provider.PropertyDescriptor(object, propertyDescriptor).getLabelProvider();
				return new ExtendedDialogCellEditor(composite, labelProvider) {

					@Override
					protected Object openDialogBox(Control cellEditorWindow) {
						AdapterFactory contentProviderAdapterFactory = getAdapterFactory();
						ITreeContentProvider contentProvider = new AdapterFactoryContentProvider(contentProviderAdapterFactory instanceof ComposeableAdapterFactory ? ((ComposeableAdapterFactory) contentProviderAdapterFactory).getRootAdapterFactory() : contentProviderAdapterFactory);
						ElementTreeSelectionDialog dialog = new ElementTreeSelectionDialog(cellEditorWindow.getShell(), labelProvider, contentProvider);
						dialog.setInput(((EObject) object).eResource());
						// ... TODO ...
						dialog.open();
						return dialog.getResult();
					}
				};
			}
		};
		
		itemPropertyDescriptors
				.add(createItemPropertyDescriptor
				  (((ComposeableAdapterFactory) adapterFactory).getRootAdapterFactory(),
				   getResourceLocator(),
				   getString("_UI_XXX_YYY_feature"),
				   "...",
				   XXXPackage.Literals.YYY_ZZZ,
				   true,
				   false,
				   true,
				   null,
				   null,
				   null,
				   editorFactory));
	}