Need 2 way binding between 2 components flex 4 - actionscript-3

Question

Can anyone tell me how to do 2-way Binding between 2 components?
I have a TabGroup, in which I created 2 tabs.. Each tab has each component...
First tab: Some form is there and submit button
Second Tab: Datagrid
So, when I enter some details and click Submit button, 1 row should be added in Datagrid.. This functionality is working, BUT when i double click the row in Datagrid, the row details from Datagrid should be filled up in Form which iam not getting this..
PLease check below code , run it, and provide me solution:
Main.mxml
<?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"
xmlns:components="components.*"
creationComplete="init()">
<fx:Script>
<![CDATA[
import components.EmployeeSingleton;
[Bindable]
public var empSingleton: EmployeeSingleton;
public function init(): void
{
empSingleton = EmployeeSingleton.getInstance();
}
]]>
</fx:Script>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:VGroup>
<s:TabBar dataProvider="{contact}" />
<mx:ViewStack id="contact"
resizeToContent="true">
<components:ContactInfo id="contactInfo"
label="Employee Info"
empSingleton="{empSingleton}"/>
<components:ContactList label="Employee List"
empSingleton="{empSingleton}"/>
</mx:ViewStack>
</s:VGroup>
</s:Application>
EmployeeSingleton.as
package components
{
import mx.collections.ArrayCollection;
[Bindable]
public final class EmployeeSingleton
{
private static var instance: EmployeeSingleton;
public var empData: ArrayCollection;
public function EmployeeSingleton()
{
}
public static function getInstance(): EmployeeSingleton
{
if(instance == null)
instance = new EmployeeSingleton();
return instance;
}
}
}
EmployeeVO.as
package vo
{
[Bindable]
public class EmployeeVO
{
public function EmployeeVO()
{
}
public var empName: String;
public var address: String;
public var state: String;
public var city: String;
public var zip: String;
}
}
ContactInfo.mxml
<?xml version="1.0" encoding="utf-8"?>
<s:NavigatorContent xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" width="400" height="300">
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import vo.EmployeeVO;
public var empSingleton: EmployeeSingleton;
private var empVO : EmployeeVO;
private var empCollection : ArrayCollection = new ArrayCollection();
protected function submit_clickHandler(event:MouseEvent):void
{
empVO = new EmployeeVO();
empVO.empName = empName.text;
empVO.address = address.text;
empVO.city = city.text;
empVO.state = state.text;
empVO.zip = zip.text;
empCollection.addItem(empVO);
empSingleton.empData = empCollection;
}
]]>
</fx:Script>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:Form>
<s:FormItem label="Name">
<s:TextInput id="empName" />
</s:FormItem>
<s:FormItem label="Address">
<s:TextInput id="address" />
</s:FormItem>
<s:FormItem label="City">
<s:TextInput id="city" />
</s:FormItem>
<s:FormItem label="State">
<s:TextInput id="state" />
</s:FormItem>
<s:FormItem label="Zip">
<s:TextInput id="zip" />
</s:FormItem>
<s:FormItem>
<s:Button id="submit"
label="Submit"
click="submit_clickHandler(event)"/>
</s:FormItem>
</s:Form>
</s:NavigatorContent>
ContactList.mxml
<?xml version="1.0" encoding="utf-8"?>
<s:NavigatorContent xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" width="400" height="300"
>
<fx:Script>
<![CDATA[
[Bindable]
public var empSingleton: EmployeeSingleton;
]]>
</fx:Script>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:DataGrid id="empData"
dataProvider="{empSingleton.empData}"/>
</s:NavigatorContent>
Awaiting for solution, please run above code and provide me solution for 2-way binding

Answer 1

You don't need to bind for 'update for on double click on an item in list'. Bindings are very tightly coupled. What you should do instead is listen for double-click events on list and update form with a item information that was double-clicked on.