TreeGrid with JSON DS

[sachage]

Hi

smartgwt-p3.0

i try to built a treegrid. This works, but no labels appear in the treegrid:

Client:

	public void onModuleLoad() {
		DataSource ds = AppsDS.getInstance();
		
		TreeGrid tGrid = new TreeGrid();
			tGrid.setLoadDataOnDemand(false);
			tGrid.setDataSource(ds);
			tGrid.setAutoFetchData(true);
			tGrid.setWidth(500);
			tGrid.setHeight(500);
			tGrid.setShowRoot(false);

			TreeGridField field = new TreeGridField("Name", "asdf", 450);
			tGrid.setFields(field);

		tGrid.draw();
	}

DS:

    public AppsDS(String id) {  
  
        setID(id);  
        setTitleField("title");
        setRecordXPath("/AppList");  
		setDataFormat(DSDataFormat.JSON);
		setDataURL("appData");
	
		DataSourceIntegerField dsfID = new DataSourceIntegerField("appID", "ApplicationID");
			dsfID.setPrimaryKey(true);
			dsfID.setRequired(true);
		DataSourceIntegerField dsfParentId = new DataSourceIntegerField("parentId", "ParentID");
			dsfParentId.setForeignKey(id + ".appID");
			dsfParentId.setRequired(true);
			dsfParentId.setRootValue("1");
			
		DataSourceTextField dsfName = new DataSourceTextField("name", "Name", 40);
		DataSourceTextField dsfTitle = new DataSourceTextField("title", "Title", 40);
			
		setFields(dsfID, dsfParentId, dsfName, dsfTitle);

        setClientOnly(true);  
    }

Servlet:

	protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
		try {
			PrintWriter out = resp.getWriter();
			out.println("{AppList: [{appID : 10, parentId : 1, ame : \"Test\", title : \"Test\"}," +
					"{appID : 20, parentId : 10, name : \"Test2\", title : \"Test2\"}," +
					"{appID : 30, parentId : 10, name : \"Test3\", title : \"Test3\"}," +
					"{appID : 40, parentId : 1, name : \"Test4\", title : \"Test4\"}," +
					"{appID : 50, parentId : 40, name : \"Test5\", title : \"Test5\"}]}");
		} catch (IOException e) {
			
			e.printStackTrace();
		}
	}

Developer Console has no errors..
What is to do that the label from 'name' or 'title' appears?

Thx