Runtime add link to text

Hey frnds,

this my code to add and remove link

<?xml version="1.0"?>

<!-- sparktextcontrols/CustomLinkElement.mxml -->

<s:Application

xmlns:fx="http://ns.adobe.com/mxml/2009"   

xmlns:mx="library://ns.adobe.com/flex/mx"    

xmlns:s="library://ns.adobe.com/flex/spark">

<s:layout>

<s:VerticalLayout horizontalAlign="center" verticalAlign="middle"/>

</s:layout>

<fx:Script>

<![CDATA[

import flashx.textLayout.edit.EditManager;

import flashx.textLayout.edit.IEditManager;

import flashx.textLayout.edit.SelectionState;

import flashx.textLayout.elements.LinkElement;

import flashx.textLayout.elements.SpanElement;

import flashx.textLayout.events.FlowElementMouseEvent;

import flashx.textLayout.formats.TextLayoutFormat;

import flashx.textLayout.operations.CutOperation;

import mx.controls.Alert;

import mx.events.FlexEvent;

protected function button1_clickHandler(event:MouseEvent):void

{

// TODO Auto-generated method stub

var textFlow:TextFlow = editor.textFlow;

var editManager:IEditManager = textFlow.interactionManager as IEditManager;

editManager.applyLink( txtLink.text );

//Alert.show(String(editManager.getSelectionState().textFlow));

} 

function removeLink(  ):void

{

var textFlow:TextFlow = editor.textFlow;

var editManager:EditManager = textFlow.interactionManager as EditManager;

editManager.applyLink( null, null, true );   

}

protected function editor_selectionChangeHandler(evt:FlexEvent):void {

var txtLayFmt:TextLayoutFormat = editor.getFormatOfRange(null,

editor.selectionAnchorPosition,

editor.selectionActivePosition);

}

]]>

</fx:Script>

<s:TextArea id="editor"

focusEnabled="true"

selectionChange="editor_selectionChangeHandler(event);">

<s:textFlow>

<s:TextFlow paragraphSpaceBefore="20">

<s:p>abhishek</s:p>

<s:p>abhishek2</s:p>

</s:TextFlow>

</s:textFlow>

</s:TextArea>

<s:TextInput id="txtLink"  />

<s:Button label="Add Link" click="button1_clickHandler(event)" />

<s:Button label="Remove Link" click="removeLink()" />

</s:Application>

what should i change in this to run code properly, means to apply and remove link for selcted text ?

thx in advanced,