extjs how to determine if combobox change event was fire by user - extjs

Question

I am trying Extjs and I am trying this scenario: I have a combobox which will display the first level in a hierarchy by default. That is to say:
0001
0001.0002
0001.0002.0004
0001.0003
0005
First level would be 0001 and 0005. If I select 0001 it goes into the restapi and fetches 0001.0002 and 0001.0003. That behavior is working as expected. My problem is this: I have to show the fetched data in this very same combobox and to keep selected the item I chose first. What my combo is doing is loading the data, but unselecting everything. Here is what I did so far:
var store = Ext.create('mycomponents.store.mystore', {});
var selectedText = '';
var autoSelec = false;
Ext.define('mycomponents.view.myview', {
extend: 'Ext.container.Container',
id: 'myview',
alias: 'widget.newComponent',
xtype: 'myview',
items: [
{
xtype: 'combobox',
reference: 'levels',
publishes: 'value',
fieldLabel: 'Options',
displayField: 'val',
valueField: 'val',
queryMode: 'local',
lastQuery: '',
emptyText: 'Please select...',
anyMatch: true,
anchor: '-15',
store: store,
minChars: 0,
typeAhead: true,
triggerAction: 'all',
selectOnFocus:true,
typeAheadDelay: 100,
labelWidth: 100,
labelAlign: 'right',
width: 265,
pageSize: 0,
clearFilterOnBlur: true,
defaultValue: 0,
matchFieldWidth: false,
allowBlank: false,
forceSelection: true,
enableKeyEvents: true,
onTrigger2Click: function (args) {
this.select(this.getStore().getAt(0));
},
listeners: {
select: function (combo, record, eOpts) {
console.log('Select', combo, record, eOpts);
},
change: function (item, newValue, oldValue) {
if (!autoSelec && newValue !== oldValue && !store.isLoading() && item.selection) {
if (newValue) {
selectedText = newValue;
}
store.proxy.extraParams = {
sort: 'clave',
'filter[activo]': true,
'filter[idpadre]': item.selection.data.idelemento
};
store.load({
callback: function () {
var items = store.data.items;
if (items.length) {
console.log('MY STORE >>>', items);
}
autoSelec = true;
}
});
}
}
}
}
],
initComponent: function () {
this.callParent(arguments);
var that = this;
}
});
How can I set the previous chosen item as the selectt item after the store load and therefore not to allow the reload of the store?

Answer 1

I found a solution after of spent all day long of searching and reading. Maybe this could sound very naive, but I'm starting with Extjs.
Here is the solution:
var items = store.data.items;
store.insert(0, mypreviousElement);
item.setValue(items[0]);
item.focus();
from here, item is my combo... this is a callback after store.load, hope this might help.