How come I can't convert the root variable to a MovieClip?

in 1 of custom classes program trying access main timeline within it. following code have used before, reason not seem working now. full error (during runtime, not during compiling)

[code]

typeerror: error #1034: type coercion failed: cannot convert flash.display::stage@28132041 flash.display.movieclip.

    @ buttongame/onaddedtostage()

    @ flash.display::displayobjectcontainer/addchild()

    @ flash.display::stage/addchild()

    @ recover_coingame_fla::maintimeline/frame2()

[/code]

 

 

and code is:

[code]

package  {

    import flash.display.movieclip;

    import flash.events.event;

    import flash.media.sound;

    import flash.events.mouseevent;

    public class buttongame extends movieclip

    {        private var _root:object;

        private var buttonsound1:sound;       

 

        public function buttongame(btnx:int, btny:int, btnwidth:int, btnheight:int, btnstring:string)

        {

            addeventlistener(mouseevent.click, clickhandler);

            addeventlistener(event.added_to_stage, onaddedtostage);

        }

 

        function onaddedtostage(e:event):void

        {

            _root = movieclip(root); //code error referencing to.

            buttonsound1 = _root._resource.coinsound;

            removeeventlistener(event.added_to_stage, onaddedtostage);

        }

 

        private function clickhandler(e:mouseevent):void

        {

            buttonsound1.play();

        }

 

    }

 

}

[/code]

and same exact code worked in different class, reason doesn't seem work this.

please i've been stuck on hour, trying many different things , searching internet.

 

-thanks

use

 

private var _root:movieclip;

 

but casting object wouldn't cause error.  fla must using other buttongame class file.

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