Movie Clip Doesn't Talk To UILoader

On my main stage I have an instance of the UILoader named viewer_mc. I also have a movie cllip named thumbs_mc that has thumbnails dynamically loaded from an XML list. All my pieces of code work except the showPhoto function, which constantly yields the error message "1120: Access of undefined property viewer_mc."

I've also tried root.viewer_mc, stage.viewer_mc, _root.viewer_mc, this.viewer_mc, etc. All yield the same error message except this.viewer_mc, which yields a different error message.

I've uploaded my files at http://vicesbyproxy.com/staging/Archive.zip. Here is my code on the movie clip:


Code:
var imageLoader:Loader;
var xml:XML;
var xmlList:XMLList;

var xmlLoader:URLLoader = new URLLoader();
xmlLoader.load(new URLRequest("data/images.xml"));
xmlLoader.addEventListener(Event.COMPLETE, xmlLoaded);

function xmlLoaded(event:Event):void {
xml = XML(event.target.data);
xmlList = xml.children();

for(var i:int = 0; i < xmlList.length(); i++) {
imageLoader = new Loader();
imageLoader.load(new URLRequest(xmlList[i].attribute("thumb")));
imageLoader.x = (i * 61);
imageLoader.y = 0;
imageLoader.name = xmlList[i].attribute("source");
addChild(imageLoader);
imageLoader.addEventListener(MouseEvent.CLICK, showPhoto);
}
}

function showPhoto(event:MouseEvent):void {
viewer_mc.load(new URLRequest(event.target.name));

}
Here's the code on the main stage:


Code:
var minScroll:Number = thumbs_mc.x;
var maxScroll:Number = minScroll + thumbs_mc.x - mask_mc.width;
var targetScroll:Number = thumbs_mc.x;
var scrollAmt:Number = 15;
var scrollDirection:Number = 0;
var easing:Number = 4;

function scrollLeft(event:MouseEvent):void {
setDirection(-scrollAmt);
}

function scrollRight(event:MouseEvent):void {
setDirection(scrollAmt);
}

function setDirection(dir:Number):void {
//thumbs_mc.x += dir;
scrollDirection = dir;
stage.addEventListener(Event.ENTER_FRAME, scrollThumbs);
stage.addEventListener(MouseEvent.MOUSE_UP, stopScrolling);
}

function scrollThumbs(event:Event):void {
targetScroll += scrollDirection;
/*
thumbs_mc.x = targetScroll;
if you don't like easing, comment out the next line instead
*/
thumbs_mc.x -=(thumbs_mc.x - targetScroll) / easing;
if (thumbs_mc.x > minScroll) {
thumbs_mc.x = minScroll;
targetScroll = minScroll;
}
else if(thumbs_mc.x < maxScroll) {
thumbs_mc.x = maxScroll;
targetScroll = maxScroll;
}
}

function stopScrolling(event:MouseEvent):void {
scrollDirection = 0;
}

left_btn.addEventListener(MouseEvent.MOUSE_DOWN, scrollLeft);
right_btn.addEventListener(MouseEvent.MOUSE_DOWN, scrollRight);
I know the showPhoto function is outputting the correct information because a trace statement yields the expected results. I should mention that I'm a beginning coder who doesn't know any programming languages. I extrapolated the code from a Lynda.com tutorial.

• Talk To A Textfield That Isn't On The First Frame Of A Movie Clip?
• Having A Loaded Movie Clip Talk To Another Movie Clip
• Loaded Movie Clip To Talk To The Movie That Loaded It
• Why Doesn't This Movie Clip Work Right?
• Movie Clip Doesn't Appear On Stage
• Movie Clip Doesn't Move
• Movie Clip Doesn't Move
• Why Doesn't A Button Work In A Movie Clip?
• Duplicated Movie Clip Doesn't Animate
• Movie Clip Doesn't Closed Correctly
• Button Within Movie Clip Doesn't Work
• When I Load A Movie Clip Into A Target It Doesn't Appear In The Center
• When I Load A Movie Clip Into A Target It Doesn't Appear In The Center
• Removing A Movie Clip From Inside Itself Doesn't Work :(
• Why A Button Doesn's Work Inside A Movie Clip?
• Nested Movie Clip Doesn't Play Properly
• Dynamic Text Doesn't Show Up In Movie Clip?
• Problem With Movie Clip: Doesn't Play Forever
• Movie Clip Button GotoAndPlay Doesn't Work
• PLEASE HELP - How Do I Intialize A Movie Clip When Onload Doesn't Work
• Buttons Inside Movie Clip Doesn't Work On Over
• Guestbook Doesn't Work When Loaded Into Empty Movie Clip?
• Stop Action Doesn't Work Inmovie Clip In A Movie
• Attachmovie Loads A Movie Clip With A Button That Doesn't Rollover
• Guestbook Doesn't Work When Loaded Into Empty Movie Clip?
• Skip To Previous Scene From Movie Clip Doesn't Seem To Work Can You Help
• Last Empty Movie Clip Generated Doesn't Fire EnterFrame More Than Once
• Guestbook Doesn't Work When Loaded Into Empty Movie Clip?
• Skip To Previous Scene From Movie Clip Doesn't Seem To Work Can You Help
• Check Size Of Movie Clip After It Changed? My Code Doesn't Work. Why Oh Why...
• Image Scroller Script Doesn't Work When Put Inside Movie Clip
• Dynamic Text From .txt File Doesn't Work Inside Movie Clip
• Help GotoAndStop Code Doesn't Work After I Convert A Button To Movie Clip
• Help GotoAndStop Code Doesn't Work After I Convert A Button To Movie Clip
• Making One Movie Talk To Another..
• Talk To Loaded Movie
• Talk To Main Movie From A Loaded Movie?
• Making A Flash Movie Talk To Me
• Talk To Loaded External Movie
• Making Movie Clips To Talk To Each Other
• Talk To Loaded Child Movie
• [CS3] How To Talk To Dynamically Loaded Movie
• Getting External Swf To Talk To The Main Movie
• Using 'tell Target' How Can I Get A Loaded Movie To Talk To _level0?
• Making Duplicate Movie Clips Talk To Each Other
• How Does A Loaded Swf Talk Back To The Main Movie?
• Making Multiple Flash Movie Clips Talk
• Making Multiple Flash Movie Clips Talk
• Button Inside Movie Clip Inside Scrollpane Doesn't Work In Xml