as3 - how to add multi custom class into one asset? - actionscript-3

Question

I'm a new mem of as3. Today i make a work but i was stacked. pls help me:
My example:
• I have a Symbol in Library with linkage name: box_mc
import flash.display.MovieClip;
import flash.events.Event;
import Src.smoothAnimate;
var box_is:MovieClip = new box_mc();
box_is.name = 'box_na';
addChild(box_is);
var box_is:smoothAnimate = new smoothAnimate(); // ERROR 1151 HERE
• i have a custom class :
package Src
{
import flash.display.*;
import flash.events.Event;
/**
* ...
* #author Trunglvt
*/
public class smoothAnimate extends MovieClip
{
private var currentW:Number;
private var currentH:Number;
private var endX:Number;
private var endY:Number;
private var sp:Number;
function smoothAnimate() {
trace('trace');
}
public function changeSize(speed:Number, newW:Number, newH:Number) {
trace('test');
this.endX = newW; // get new size
this.endY = newH;
this.sp = speed;
this.addEventListener(Event.ENTER_FRAME, onFrame);
}
private function onFrame(e:Event) {
e.target.currentW = e.target.width;
e.target.currentH = e.target.height;
e.target.width += (e.target.endX - e.target.currentW) * e.target.sp;
e.target.height += (e.target.endY - e.target.currentH) * e.target.sp;
if (Math.floor(e.target.width) == Math.floor(e.target.endX) ||
Math.floor(e.target.height) == Math.floor(e.target.endY)) {
//stop function enterFrame here;
removeEventListener(Event.ENTER_FRAME, onFrame);
}
}
}
}
but when run is make error:
1151: A conflict exists with definition box_is in namespace internal.
i want when flash run, the box_is will be add in stage, resize by function changesize.
Pls help me.
Thank you.

Answer 1

When you say:
var box_is:smoothAnimate = new smoothAnimate();
This declaration will error. You previously declared box_is when you said:
var box_is:MovieClip = new box_mc();
Two var cannot have the same name in the same scope.
If you want to reuse the box_is symbol, don't use var. Just reassign box_is:
box_is = new smoothAnimate();