Flex ComboBox中的Tree itemRender ClassFactory 实现

想要实现ComboBox下来出来一颗树，用itemRender来实现，只编写了最基本的代码，更多功能可以自己添加。

新建TreeComboBox.as 和 TreeComboBoxRender.as，（在src/components/TreeComboBox下）代码如下：
TreeComboBox 
package components.TreeComboBox
{
import mx.controls.ComboBox;
import mx.core.ClassFactory;

public class TreeComboBox extends ComboBox
{
private var _factory:ClassFactory;
public function get factory():ClassFactory {
if (_factory == null)
{
_factory = new ClassFactory();
_factory.generator = TreeComboBoxRender;
_factory.properties = {
width:this.width, 
outerDocument:this
};
}
return _factory;        
}
public function TreeComboBox()
{
super();
this.dropdownFactory = factory;
} 
}
}
TreeComboBoxRender
package components.TreeComboBox
{
import mx.controls.Tree;

public class TreeComboBoxRender extends Tree
{
[Bindable]
public var outerDocument:TreeComboBox;
public function TreeComboBoxRender()
{
super();
}
}
}
application 如下：
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
xmlns:rp="components.TreeComboBox.*">
<mx:Script>
<![CDATA[
[Bindable]
public var xml:XML = <root>
<node label="a"/>
<node label="b"/>
<node label="c"/>
</root>
]]>
</mx:Script>
<mx:VBox width="100%" height="100%">
<rp:TreeComboBox id="treeComboBox" dataProvider="{xml.children()}" 
labelField="@label" width="100"/>
<mx:TextInput text="{treeComboBox.text}" width="200"/>
</mx:VBox>
</mx:Application>
结果如右图：

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