Flex Tree×é¼þDemo

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Raw objects are often not sufficient if you have data that changes, because the data provider component does not receive a notification of any changes to the base object. The component therefore does not get updated until it must be redrawn due to other changes in the application, or if the data provider is reassigned. At that time, it gets the data again from the updated raw object.
Here is the demo(Ôõô²åÈëswfÎļþ£¿ÓÃembed±êÇ©£¿)
Source code here:
<?xml version="1.0"?>
<!-- dpcontrols/TreeSimple.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" fontSize="12">
<mx:Script>
<!--[CDATA[
import mx.collections.ArrayCollection;
import mx.collections.XMLListCollection;

[Bindable]
private var list:XML = <list/>;

public function onBtnAddNodeClick(e:Event):void
{
var newNodeName:String = nodeName.text;
if(newNodeName.length == 0)
return;

var currentNode:XML = XML(tree.selectedItem);
if(currentNode == null || currentNode.@type!=1)
return;

var newNode:XML = <node/>;
newNode.@label = newNodeName;
newNode.@type= 1;
newNode.@isBranch = true;

currentNode.appendChild(newNode);
}

public function onBtnAddTopNodeClick(e:Event):void
{
var newNodeName:String = nodeName.text;
if(newNodeName.length == 0)
return;

var newNode:XML = <node/>;
newNode.@label = newNodeName;
newNode.@type= 1;
newNode.@isBranch = true;
list.appendChild(newNode);
}

public function onBtnDelNodeClick(e:Event):void
{
var currentNode:XML = XML(tree.selectedItem);
if(currentNode == null)
return;
var sibling:X