Add ToolTip in List/ComboBox Control

<?xml version=”1.0″?>
<mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml” creationComplete=”initApp()”>
 <mx:Script>
  <![CDATA[
   import mx.collections.ArrayCollection;
   [Bindable]
   private var myDP:ArrayCollection = new ArrayCollection([{name:"Yahoo", blog:"http://www.yahoo.com/"},{name:"Kanu",  blog:"http://kanuwadhwa.wordpress.com"},{name:"Google", blog:"http://www.google.com/"}]);
   [Bindable]
   private var myDropdownFactory:ClassFactory;
   private function initApp():void{
    myDropdownFactory = new ClassFactory(List);
    myDropdownFactory.properties = {showDataTips:true, dataTipFunction:myDataTipFunction}
   }
   private function myDataTipFunction(value:Object):String{
    return (value.name+”’s blog is “+value.blog);
   }
  ]]>
 </mx:Script>
<mx:List id=”myList” dataProvider=”{myDP}” labelField=”name” showDataTips=”true” dataTipFunction=”myDataTipFunction” />
<mx:ComboBox id=”myCB” dataProvider=”{myDP}” labelField=”name” prompt=”Choose a Blogger” dropdownFactory=”{myDropdownFactory}” />
</mx:Application>