I try change list size in swf from js. It`s not work. 
SWF
import flash.external.ExternalInterface;
ExternalInterface.addCallback( "methodResize", this, swfResize);
function swfResize(winX, winY) { my_list.setSize(winX, winY); }
function init (){ this.createClassObject(mx.controls.List, "my_list", 1); my_list.setSize(260,224);
....
JS
var win = (thisinstanceof Panel) ? this : new Window("palette", scriptName, undefined, {resizeable: true});
win.flashPlayer = win.add("flashplayer", [0, 0, 260, 224], flashFile);
win.onResizing = function () { var winX = win.windowBounds[2]; var winY = win.windowBounds[3]; win.flashPlayer.preferredSize = [winX, winY]; win.flashPlayer.methodResize(winX, winY); }