ExtensionContext error while creating Native Extension in Flex 3.6 SDK

Question

I'm creating native extension with Flex 3.6 . Coded native side then created Flex Library Project and then create .ane file. Finally imported .ane file to myFlex Project.
Here is the problem I had. While I'm debugging app, "1046: Type was not found or was not a compile-time constant: ExtensionContext" error occurs. Attached the Library project .as class .
Thanks in Advance
package com.extension.samples
   import flash.events.EventDispatcher;
   import flash.events.IEventDispatcher;
   import flash.external.ExtensionContext;
   public class NetworkConnectionANE extends EventDispatcher
        public var _extContext : ExtensionContext;
        public function NetworkConnectionANE(target:IEventDispatcher=null)
            _extContext = ExtensionContext.createExtensionContext("com.extension.samples.NetworkConnectionANE", null);
             super(target);
        public function Connect(path:String):int
             return _extContext.call("nativeFunc", path);
        public function dispose():void
            _extContext.dispose();
Edit: I tried to use .swc file that created from library project in another Flex Desktop app, but the same error
    Also tried with     _extContext = ExtensionContext.createExtensionContext("com.extension.samples.NetworkConnectionANE","");
Edit: The problem about Flex SDK, there is no problem in SDK 4.6. Now the question is, How to use Extension in lib project in Flex 3.6 SDK ?

Answer 1

I'm sure, I use Flex 3.6.0 SDK version. When I want to create a library project in 3.6.0, already I couldn't see  ExtensionContext class in flash.external package. If I create in v4.6, I'm having problem when I start to debug my v3.6 desktop application. Now I want to learn
Does Flex v3.6.0 support NativeExtension ?
   if Yes ,
which class is equal to ExtensionContext in v3.6.0
or How can I import ExtensionContext class to v3.6.0
Thanks