How to stop a slideshow and show another movie clip at the end?

Question

Currently my slideshow is in a loop. At the end of last slideshow, I want to show another movie clip (End_mv) that's on another layer. How do I do that? My current scripts are below:
import fl.transitions.Tween;
import fl.transitions.easing.*;
//change scale on an image
var fadeTween:Tween;
//To slide in on X axis
var slideXTween:Tween;
//To slide in on Y axis
var slideYTween:Tween;
//To fade IN
var alphaTween:Tween;
//To get bigger on its X axis
var scaleXTween:Tween;
//To get bigger on its Y axis
var scaleYTween:Tween;
//var fadeTween:Tween;
//description place holder
var strDescrp:String;
//source place holder
var strSource:String;
//x poistion
var posX:Number;
//y position
var posY:Number;
//degree rotation
var degreeRot:Number;
// delay between slides
//const TIMER_DELAY:int = 5000;
var TIMER_DELAY:int = 5000;
// fade time between slides
const FADE_TIME:int = 3;
// reference to the current slider container
var currentContainer:Sprite;
// index of the current slide
var intCurrentSlide:int = -1;
// total slides
var intSlideCount:int;
// timer for switching slides
var slideTimer:Timer;
// slides holder
var sprContainer1:Sprite;
var sprContainer2:Sprite;
// slides loader
var slideLoader:Loader;
// url to slideshow xml
var strXMLPath:String = "lstHouse.xml";
// slideshow xml loader
var xmlLoader:URLLoader;
// slideshow xml
var xmlSlideshow:XML;
var txtField:TextField = new TextField();
var formatText:TextFormat = new TextFormat();
//start of sound section is for sound
var soundReq:URLRequest = new URLRequest("PaukenBrumfiel_AngelsOnHigh.mp3");
var sound:Sound = new Sound();
sound.load(soundReq);
sound.addEventListener(Event.COMPLETE, onComplete);
//end of sound section
function onComplete(event:Event):void
    sound.play();
function init():void
    // create new urlloader for xml file
    xmlLoader = new URLLoader();
    // add listener for complete event
    xmlLoader.addEventListener(Event.COMPLETE, onXMLLoadComplete);
    // load xml file
    xmlLoader.load(new URLRequest(strXMLPath));
    // create new timer with delay from constant
    slideTimer = new Timer(TIMER_DELAY);
    // add event listener for timer event
    slideTimer.addEventListener(TimerEvent.TIMER, switchSlide);
    // create 2 container sprite which will hold the slides and
    // add them to the masked movieclip
    sprContainer1 = new Sprite();
    sprContainer2 = new Sprite();   
    mcSlideHolder.addChild(sprContainer1);
    mcSlideHolder.addChild(sprContainer2);
    // keep a reference of the container which is currently
    // in the front
    currentContainer = sprContainer2;
function onXMLLoadComplete(event:Event):void
    // create new xml with the received data
    xmlSlideshow = new XML(event.target.data);
    // get total slide count
    intSlideCount = xmlSlideshow..image.length();
    // switch the first slide without a delay
    switchSlide(null);
function fadeSlideIn(e:Event):void {
    // add loaded slide from slide loader to the
    // current container
    currentContainer.addChild(slideLoader.content);
    // clear preloader text
    //mcInfo.lbl_loading.text = "";
    // fade the current container in and start the slide timer
    // when the tween is finished
    //Tweener.addTween(currentContainer, {alpha:1, time:FADE_TIME, onComplete:function() { slideTimer.start(); }});       
    //strSource = xmlSlideshow.image[intCurrentSlide].@src;
    fadeTween = new Tween(currentContainer, "alpha", Regular.easeInOut, 0, 1, 2, true)
    //scale = new Tween(currentContainer, "alpha", Regular.easeInOut, 0, 1, 2, true)
    slideTimer.start()
    onComplete:function();
function switchSlide(e:Event):void
    // check, if the timer is running (needed for the
    // very first switch of the slide)
    if(slideTimer.running)
        slideTimer.stop();
    // check if we have any slides left and increment
    // current slide index
    if(intCurrentSlide + 1 < intSlideCount)
        intCurrentSlide++;
    // if not, start slideshow from beginning
    else
        intCurrentSlide = 0;
    // check which container is currently in the front and
    // assign currentContainer to the one that's in the back with
    // the old slide
    if(currentContainer == sprContainer2)
        currentContainer = sprContainer1;
    else
        currentContainer = sprContainer2;
    // hide the old slide
    currentContainer.alpha = 0;
    // bring the old slide to the front
    mcSlideHolder.swapChildren(sprContainer2, sprContainer1);
    strDescrp = xmlSlideshow.image[intCurrentSlide].@desc;
    //strSource = xmlSlideshow.image[intCurrentSlide].@src;
    //txtField.border = true;
    //txtField.x = 0;
    //txtField.y = 600;
    txtField.width = 855;
    txtField.height = 200;   
    //txtField.background = true;
    //txtField.backgroundColor = 0xEE9A00;
    txtField.alpha = 20;
    txtField.text = strDescrp;
    formatText.align = TextFormatAlign.CENTER;
    //txtField.autoSize = TextFieldAutoSize.LEFT;
    formatText.color = 0x000;
    formatText.size = 30;
    txtField.x = 0;
    txtField.y = 550;
    posX = 0;
    posY = 0;
    degreeRot = 0;
    // create a new loader for the slide
    slideLoader = new Loader();
    // add event listener when slide is loaded
    slideLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, fadeSlideIn);
    // load the next slide
    slideLoader.load(new URLRequest(xmlSlideshow.image[intCurrentSlide].@src));   
    addChild(txtField);
    txtField.setTextFormat(formatText)
// init slideshow
init();

Answer 1

I got this error:
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
    at flash.display::DisplayObjectContainer/swapChildren()
    at University_Advancement_Holiday_Greeting2012_fla::MainTimeline/switchSlide()
    at flash.utils::Timer/_timerDispatch()
    at flash.utils::Timer/tick()
And here's the code:
// import tweener
//import caurina.transitions.Tweener;
import fl.transitions.Tween;
import fl.transitions.easing.*;
import flash.display.MovieClip;
//change scale on an image
var fadeTween:Tween;
//To slide in on X axis
var slideXTween:Tween;
//To slide in on Y axis
var slideYTween:Tween;
//To fade IN
var alphaTween:Tween;
//To get bigger on its X axis
var scaleXTween:Tween;
//To get bigger on its Y axis
var scaleYTween:Tween;
//var fadeTween:Tween;
//description place holder
var strDescrp:String;
//source place holder
var strSource:String;
//x poistion
var posX:Number;
//y position
var posY:Number;
//degree rotation
var degreeRot:Number;
// delay between slides
//const TIMER_DELAY:int = 5000;
var TIMER_DELAY:int = 5000;
// fade time between slides
const FADE_TIME:int = 3;
// reference to the current slider container
var currentContainer:Sprite;
// index of the current slide
var intCurrentSlide:int = -1;
// total slides
var intSlideCount:int;
// timer for switching slides
var slideTimer:Timer;
// slides holder
var sprContainer1:Sprite;
var sprContainer2:Sprite;
// slides loader
var slideLoader:Loader;
// url to slideshow xml
var strXMLPath:String = "lstHouse.xml";
// slideshow xml loader
var xmlLoader:URLLoader;
// slideshow xml
var xmlSlideshow:XML;
var txtField:TextField = new TextField();
var formatText:TextFormat = new TextFormat();
//var myEnding:MovieClip = stage.getChildByName('End_mc') as MovieClip;
//start of sound section is for sound
var soundReq:URLRequest = new URLRequest("PaukenBrumfiel_AngelsOnHigh.mp3");
var sound:Sound = new Sound();
sound.load(soundReq);
sound.addEventListener(Event.COMPLETE, onComplete);
//end of sound section
function onComplete(event:Event):void
    sound.play();
function init():void
    //reference my movie clip "End_mc" oon the stage and turn its visibility off
    MovieClip(getChildByName('End_mc')).visible = false;
    // create new urlloader for xml file
    xmlLoader = new URLLoader();
    // add listener for complete event
    xmlLoader.addEventListener(Event.COMPLETE, onXMLLoadComplete);
    // load xml file
    xmlLoader.load(new URLRequest(strXMLPath));
    // create new timer with delay from constant
    slideTimer = new Timer(TIMER_DELAY);
    // add event listener for timer event
    slideTimer.addEventListener(TimerEvent.TIMER, switchSlide);
    // create 2 container sprite which will hold the slides and
    // add them to the masked movieclip
    sprContainer1 = new Sprite();
    sprContainer2 = new Sprite();   
    mcSlideHolder.addChild(sprContainer1);
    mcSlideHolder.addChild(sprContainer2);
    // keep a reference of the container which is currently
    // in the front
    currentContainer = sprContainer2;
//function onXMLLoadComplete(e:Event):void
function onXMLLoadComplete(event:Event):void
    // create new xml with the received data
    xmlSlideshow = new XML(event.target.data);
    // get total slide count
    intSlideCount = xmlSlideshow..image.length();
    // switch the first slide without a delay
    switchSlide(null);
function fadeSlideIn(e:Event):void {
    // add loaded slide from slide loader to the
    // current container
    currentContainer.addChild(slideLoader.content);
    // clear preloader text
    //mcInfo.lbl_loading.text = "";
    // fade the current container in and start the slide timer
    // when the tween is finished
    //Tweener.addTween(currentContainer, {alpha:1, time:FADE_TIME, onComplete:function() { slideTimer.start(); }});       
    //strSource = xmlSlideshow.image[intCurrentSlide].@src;
    fadeTween = new Tween(currentContainer, "alpha", Regular.easeInOut, 0, 1, 2, true)
    //scale = new Tween(currentContainer, "alpha", Regular.easeInOut, 0, 1, 2, true)
    slideTimer.start()
    onComplete:function();
function switchSlide(e:Event):void
    // check, if the timer is running (needed for the
    // very first switch of the slide)
    if(slideTimer.running)
        slideTimer.stop();
    // ADDED: Check if using sprContainer2 and at the last slide
    //if ((currentContainer == sprContainer2) && (intCurrentSlide == intSlideCount))
    trace("Current Slide: " + intCurrentSlide);
    trace("SlideCount: " + intSlideCount);
    if ((currentContainer == sprContainer2) && ((intCurrentSlide + 1) == intSlideCount))
        // hide the slideshow (and other related elements, or remove them if desired)
        //mcSlideHolder.visible = false;
        // remove any clips directly inside slideshow (any timers/etc need to be stopped too)
         while (mcSlideHolder.numChildren > 0)
            mcSlideHolder.removeChildAt(0);
        // I do see a var named 'sound' playing so you might want to:
         //sound.stop();
         //sound = null;
        // etc any other slideshow-only elements to hide/remove..
        // play your movie
        MovieClip(getChildByName('End_mc')).visible = true;
        MovieClip(getChildByName('End_mc')).play();       
    // check if we have any slides left and increment
    // current slide index
    if(intCurrentSlide + 1 < intSlideCount)
        intCurrentSlide++;
    // if not, start slideshow from beginning
    else
        intCurrentSlide = 0;
    // check which container is currently in the front and
    // assign currentContainer to the one that's in the back with
    // the old slide
    if(currentContainer == sprContainer2)
        currentContainer = sprContainer1;
    else
        currentContainer = sprContainer2;
    // hide the old slide
    currentContainer.alpha = 0;
    // bring the old slide to the front
    mcSlideHolder.swapChildren(sprContainer2, sprContainer1);
    strDescrp = xmlSlideshow.image[intCurrentSlide].@desc;
    //strSource = xmlSlideshow.image[intCurrentSlide].@src;
    //txtField.border = true;
    //txtField.x = 0;
    //txtField.y = 600;
    txtField.width = 855;
    txtField.height = 200;   
    //txtField.background = true;
    //txtField.backgroundColor = 0xEE9A00;
    txtField.alpha = 20;
    txtField.text = strDescrp;
    formatText.align = TextFormatAlign.CENTER;
    //txtField.autoSize = TextFieldAutoSize.LEFT;
    formatText.color = 0x000;
    formatText.size = 30;
    txtField.x = 0;
    txtField.y = 550;
    posX = 0;
    posY = 0;
    degreeRot = 0;
    // create a new loader for the slide
    slideLoader = new Loader();
    // add event listener when slide is loaded
    slideLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, fadeSlideIn);
    // add event listener for the progress
    //slideLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, showProgress);
    // load the next slide
    slideLoader.load(new URLRequest(xmlSlideshow.image[intCurrentSlide].@src));   
    addChild(txtField);
    txtField.setTextFormat(formatText)   
// init slideshow
init();