combobox - How to work with treecombo in Extjs 4.1 -

i found tutor in http://www.sencha.com/forum/showthread.php?198856-ext.ux.treecombo
try make treecombo in extjs4.1 in http://jsfiddle.net/rq2ha/ here code

ext.onready(function() {         ext.create('ext.ux.treecombo', {             margin:10,             width:120,             height: 10,             treeheight: 10,             treewidth: 240,             renderto: 'treecombo3',             store: storemenu,             selectchildren: false,             canselectfolders: true             ,itemtreeclick: function(view, record, item, index, e, eopts, treecombo)             {                  var id = record.data.id;                 // want here.                  // combo nothing (not selected item or not finish) when init itemtreeclick function             }         }); }); 

1st problem: want id of tree , when click item of tree on combo. combo not complete (seleted) when click (combo nothing).

2nd problem: if change store dynamic like

var treestore = ext.create('ext.data.treestore', {         proxy: {             type: 'ajax',             url: 'example.php',             reader: {                 type: 'json'             }         },         autoload: true     }); 

i error

my json

[ { id : '1' , text : 'a', iconcls: 'cls1' ,children :[{ id : '2' , text : 'b', iconcls: 'cls2' ,children :[{ id : '9' , text : 'a', iconcls: 'cls' ,children :[]},{ id : '14' , text : 'a', iconcls: 'c' ,children :[{ id : '33' , text : 'b', iconcls: 'cls' ,children :[{ id : '35' , text : 'a', iconcls: 'cls' ,children :[{ id : '36' , text : 'a', iconcls: 'cls' ,children :[]}]}]}]},{ id : '16' , text : 'd', iconcls: 'cls' ,leaf:true}]},... 

how can fix thank

to solve second problem, need specify root node when creating tree store.

var treestore = ext.create('ext.data.treestore', {         root: {             text: 'root',             id: '0'         },         proxy: {             type: 'ajax',             url: 'example.php',             reader: {                 type: 'json'             }         },         autoload: true     }); 

also, should mention variable name used tree store in jsfiddle example storemenu rather treestore. if want replace static tree store ajax version, make sure using correct variable name.