[flexcoders] how to remove new object in stage

[cholid]

hi all
in my app
i've add new object 

new tesObj:TesObj = new TesObj();
addChild(tesObj);

and the after i give it instance name

tesObj.name = "idTesObj";

but when i want to remove it, it doesnt work
because hasn't found id "idTesObj"

//removeChild(idTesObj);

any help ?

this complete code :

import flash.events.MouseEvent;

var tesObj:TesObj = new TesObj();
tesObj.name = "idTesObj";
addSmall.addEventListener(MouseEvent.CLICK, addSmallFunction);
function addSmallFunction(e:MouseEvent):void
{
        addChild(tesObj);
        removeSmall.addEventListener(MouseEvent.CLICK, removeSmallFunction);    
}
function removeSmallFunction(e:MouseEvent):void
{
        tes("clip1");
}
function tes(n:String):void
{
        //removeChild(n);
        trace(n);
}

thanks for advice
regards
cholid_ridwan