mi tree con checkbox

hola a todos, he buscado un tree con checkboxes pero no he encontrado un componente o add on en el directorio de vaadin que se asemeje, asi que hice algo parecido a tree con checkbox (no es un componente nuevo), si tiene alguna sugerencia para mejorarlo les agradezco: esto es lo que hice

public class ArbolcheckApp extends Application {

	private static final long serialVersionUID = -4849995480912548058L;
	final static Object hw_PROPERTY_NAME = "name";
	final static Object hw_PROPERTY_ICON = "icon";
	final static ThemeResource x = new ThemeResource(
			"../runo/icons/16/cancel.png" );
	final static ThemeResource ok = new ThemeResource( "../runo/icons/16/ok.png" );
	private Label label = new Label( "", 3 );

	@Override
	public void init() {
		final Window mainWindow = new Window( "Arbolcheck Application" );
		final Tree tree = new Tree( "Tree sortable using drag'n'drop",
				getHardwareContainer() );
		Button button = new Button( "Verificar", new Button.ClickListener() {
			private static final long serialVersionUID = 638177444305472321L;
			String values = "Elementos Seleccionados:<br>";

			public void buttonClick( ClickEvent event ) {

				for ( Object id : tree.rootItemIds() ) {
					for ( Object id2 : tree.getChildren( id ) ) {
						if (tree.getItemIcon( id2 ).toString() == "../runo/icons/16/ok.png") {
							values += "Padre: " + id + " - Hijo: " + id2 + "<br>";

						}
					}
				}

				label.setValue( values );
				values = "Elementos Seleccionados:<br>";
			}
		} );

		mainWindow.addComponent( tree );
		mainWindow.addComponent( button );
		mainWindow.addComponent( label );
		setMainWindow( mainWindow );

		tree.setItemCaptionPropertyId( hw_PROPERTY_NAME );
		tree.setItemIconPropertyId( hw_PROPERTY_ICON );

		// Expand whole tree
		for ( Object id : tree.rootItemIds() ) {
			tree.expandItemsRecursively( id );
		}

		// Disallow selecting items from the tree
		tree.setSelectable( false );

		// listener
		tree.addListener( new ItemClickEvent.ItemClickListener() {
			private static final long serialVersionUID = -4061715387118131741L;

			public void itemClick( ItemClickEvent event ) {

				String ico = tree.getItemIcon( event.getItemId() ).toString();

				// si presiono una x coloco un ok
				if (event.getButton() == ItemClickEvent.BUTTON_LEFT
						&& "../runo/icons/16/cancel.png".equals( ico ))

					tree.setItemIcon( event.getItemId(), ok );

				// si presiono un ok coloco un x
				else if (event.getButton() == ItemClickEvent.BUTTON_LEFT
						&& "../runo/icons/16/ok.png".equals( ico ))

					tree.setItemIcon( event.getItemId(), x );

			}
		} );

	}

	public static HierarchicalContainer getHardwareContainer() {
		final String[][] hardware = { //
				{ "Desktops", "Dell OptiPlex GX240", "Dell OptiPlex GX260",
						"Dell OptiPlex GX280" },
				{ "Monitors", "Benq T190HD", "Benq T220HD", "Benq T240HD" },
				{ "Laptops", "IBM ThinkPad T40", "IBM ThinkPad T43", "IBM ThinkPad T60" } };

		Item item = null;
		int itemId = 0; // Increasing numbering for itemId:s

		// Create new container
		HierarchicalContainer hwContainer = new HierarchicalContainer();
		// Create containerproperty for name
		hwContainer.addContainerProperty( hw_PROPERTY_NAME, String.class, null );
		// Create containerproperty for icon
		hwContainer.addContainerProperty( hw_PROPERTY_ICON, ThemeResource.class, x );
		for ( int i = 0; i < hardware.length; i++ ) {
			// Add new item
			item = hwContainer.addItem( itemId );
			// Add name property for item
			item.getItemProperty( hw_PROPERTY_NAME ).setValue( hardware[ i ][ 0 ] );
			// Allow children
			hwContainer.setChildrenAllowed( itemId, true );
			itemId++;
			for ( int j = 1; j < hardware[ i ].length; j++ ) {
				if (j == 1) {
					item.getItemProperty( hw_PROPERTY_ICON ).setValue(
							new ThemeResource( "../runo/icons/16/folder.png" ) );
				}
				// Add child items
				item = hwContainer.addItem( itemId );
				item.getItemProperty( hw_PROPERTY_NAME ).setValue( hardware[ i ][ j ] );
				hwContainer.setParent( itemId, itemId - j );
				hwContainer.setChildrenAllowed( itemId, false );

				itemId++;
			}
		}
		return hwContainer;
	}

}