TreePanel in ExtJs with direct proxy behaves weird - extjs

Question

I'm using Sencha Architect 3.0.1.
I'm trying to use a Model, a TreeStore, and a TreePanel.
The Model:
Ext.define('User.model.ModelClientList', {
extend: 'Ext.data.Model',
fields: [{ name: 'id' }, { name: 'name' }, { name: 'status' } ],
proxy: {
type: 'direct',
directFn: 'UserClient.listClient',
reader: { type: 'json',root: 'data'}
}
});
The TreeStore:
Ext.define('User.store.StoreClientList', {
extend: 'Ext.data.TreeStore',
constructor: function(cfg) {
var me = this;
cfg = cfg || {};
me.callParent([Ext.apply({
model: 'User.model.ModelClientList',
storeId: 'StoreClientList'
}, cfg)]);
}
});
And the TreePanel:
{
xtype: 'treepanel',
height: 250,
itemId: 'MainClient',
width: 400,
title: 'Clients',
hideHeaders: false,
store: 'StoreClientList',
rootVisible: false,
viewConfig: {loadMask: true},
columns: [
{xtype: 'treecolumn',dataIndex: 'name',text: '..'},
{xtype: 'gridcolumn', dataIndex: 'status', text: '..'}
]
}
The json request to UserClient.listClient returns this:
{
"data":[
{"id":1,"name":"Pluto","status":3,"children":[
{"id":35,"name":"Mela","status":2,"leaf":true},
{"id":36,"name":"Pera","status":1,"leaf":true},
{"id":37,"name":"Arancia","status":1,"leaf":true}]},
{"id":2,"name":"Pippo","status":1,"leaf":true},
{"id":3,"name":"Paperino","status":2,"leaf":true}],
"success":true
}
Now, can someone explain me:
(1) Why, when I click on [+] icon of the first node the application does another ajax request instead of expanding what already got from the previous request
(2) Given this initial view:
Why when I click on the [+] it starts going crazy like this:

Answer 1

It was clearly a problem of Sencha Architect.
I rewrote from scratch in a new project the same architecture and now it works as expected.
Also, I noticed that something was going wrong with Architect becouse of simple operation made it show incomprehensible and undebuggable errors (like "Cannot set property 'DirectCfg' of null").
Unfortunately I cannot state that Sencha Architect is mature for large and complex project.. probably not even for small project. what a pity