How to communicate a button to a movie_clip inside of UiLoader component using AS3?

Question

Hi, i'm making a flash application to test various paints, for a company.
I have movie clip on stage having some buttons on left side and a uiloader on other side which loads an external swf file on button(thumb_01) click-target. In main movie clip there are two buttons. 1 trigger a function to select a wall and 2nd trigger a function to select roof. External swf(movie_01.swf) file has two movie clips 1 is a wall(mask_01) and 2nd is roof(mask_02). Now the problem is i want to click a button to select wall inside of external swf file to change it's color. I'm sure that the problem is in path through which i'm trying to select a wall movie which is inside of UiLoader. Can any one tell me What'll be the path to trigger a function to a movie clip inside of Uiloader?
Here is my code for Button to select a wall or roof ==================================
import flash.events.MouseEvent;
import fl.motion.MotionEvent;
var targetObj:Object;
selectWall_btn.addEventListener(MouseE… selectWall);
function selectWall(evt:MouseEvent):void {
targetObj = uiloader.movie_01.mask_01; <--------- I think problem is in this path....
trace ("Wall is selected!");
Here is code for uiloader ========================================…
import fl.containers.UILoader;
Object(this).slider_mc.thumb_01.addEve… loadMovie_01);
function loadMovie_01(evt:MouseEvent):void {
trace ("Movie is Loading!");
var uiLoader:UILoader = new UILoader();
uiLoader.source = "movies/movie_01.swf";
uiLoader.scaleContent = false;
uiLoader.x = 291;
uiLoader.y = 19;
addChild(uiLoader);
uiLoader.addEventListener(Event.COMPLE… completeHandler);
function completeHandler(event:Event) {
trace("Number of bytes loaded: " + uiLoader.bytesLoaded);
Error is this....
Scene 1, Layer 'ActionsScript', Frame 1, Line 43
1120: Access of undefined property uiLoader.
Can any one Help me?

Answer 1

PArt of the problem will be due to declaring the uiLoader inside of a function.  When you do that you limit its scope to within that function.  You should declare it outside of any function if you need to access it in more than one function.
import flash.events.MouseEvent;
import fl.motion.MotionEvent;
var uiLoader:UILoader;
var targetObj:Object;
The other problems I see regard the line you point to.  It is not spelling the name the same, using a lowercase "l". Also, if you want to target what the UILoader contains, you should target its "content" property, as in...
targetObj = uiLoader.content.mask_01