Extjs 4 treestore

var store = Ext.create('Ext.data.TreeStore', {
        proxy: {
            type: 'ajax',
            url: 'FoundationManage.ashx'
        },
        root: {
            text: '',
            cls: "nodecls",
            expanded: true,
            parentId: 'parentId'
        },

        folderSort: true
    });



    tree = Ext.create('Ext.tree.Panel', {
        store: store,
        renderTo: 'treeDiv',
        height: 380,
        width: '100%',

        border: 0,
        frame: false,
        bodyStyle: "background-color:#E2F2FD;",
        
        useArrows: false,
        rootVisible: false,
        layout: {
            type: "fit",
            align: "right"
        }

    });