Editable column's value not getting 'persisted' in AdvancedDataGrid - actionscript-3

Question

I have an AdvancedDataGrid (whose dataProvider is a variable being bound from my main mxml file, not sure if this is relevant to my problem ). I'm setting one of the AdvancedDataGridColumn's editable property as true, and when I click on the cell in the UI, it is infact editable. But when I press enter/move to a different cell, the old value returns and the newly entered value is lost. Would anyone have any ideas why that's happening? Do I have to manually change the variable provided in the dataProvider?...I would think that would happen automatically right? I'd appreciate any help!
Thanks.

Answer 1

This traces out correct when I edit a field and press enter then click on the button to see trace output:
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" applicationComplete="init()">
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.collections.HierarchicalData;
[Bindable]
private var companyHierarchy:HierarchicalData;
private var companyData:XML = <data>
<company name="Employees">
<department name="Unit 1">
<employee name="Dave" func="C# Developer"/>
<employee name="Bob" func="AS3 Developer"/>
<employee name="Clair" func="AS3 Architect"/>
</department>
<department name="Unit 2">
<employee name="John" func="ORACLE Developer"/>
<employee name="Sandra" func="HTML Developer"/>
</department>
</company>
</data>;
private function init():void
{
companyHierarchy = new HierarchicalData(companyData.company);
}
private function checkSetData():void
{
trace(companyData);
}
]]>
</fx:Script>
<mx:AdvancedDataGrid id="test" width="500" height="500" dataProvider="{companyHierarchy}"
displayItemsExpanded="true" editable="true" enabled="true">
<mx:columns>
<mx:AdvancedDataGridColumn dataField="#name"
headerText="Companies"/>
<mx:AdvancedDataGridColumn dataField="#func"
headerText="Function"/>
</mx:columns>
</mx:AdvancedDataGrid>
<s:Button x="205" y="508" label="Button" click="checkSetData()"/>
</s:Application>