attachMovie Problem; the loaded movie's method cannot be working

Hi

I’ve loaded a MovieClip from library usibg attachMovie () method that is triggering by clicking on a button

I want to start the "oaded MC"playing (play ()) method.

But that is not working.,

//--------------------------
on (release) {

_root.container.attachMovie ("butterfly", "butterflynew", 2);

// trace (typeof (butterflynew));

_root.butterflynew.gotoAndPlay ("start"); :hangover: 

}

//-----------------------------

Pls find the attached Zip file

Anybody to help me

Abhilash