How to call one of the function from this class?
I wanna call the function "**nextMenu**" & "**prevMenu**" from this class from Main.as
But I get the error 1136. Can help me see what I've left out on the codes?

**CategoryScroller.as**

    package com.theflashfactor.carouselStackGallery.categoryMenu
    {
    	import com.greensock.TweenMax;
    	import com.greensock.easing.Quint;
    	import com.theflashfactor.utils.Ref;
    	
    	import flash.display.Shape;
    	import flash.display.Sprite;
    	import flash.events.MouseEvent;
    	import flash.geom.Rectangle;
    	
    	/**
    	 * Scroller to switch view for category item if there are more than visibleItem available 
    	 * @author Rimmon Trieu
    	 */
    	public class CategoryScroller extends Sprite
    	{
    		private var trackLength:int = 400;
    		private var scrubber:Sprite;
    		private var track:Shape;
    		private var categoryMenu:CategoryMenu;
    		private var trans:Sprite;
    		private var center:Number;
    		
    		public function CategoryScroller(categoryMenu:CategoryMenu)
    		{
    			this.categoryMenu = categoryMenu;
    			buttonMode = true;
    			initialize();
    		}
    		
    		/**
    		 * Draw elemnt scrubber and track 
    		 */
    		private function initialize():void
    		{
    			trans = new Sprite();
    			trans.graphics.beginFill(0, 0);
    			trans.graphics.drawRect(0, 0, trackLength, 13);
    			trans.graphics.endFill();
    			trans.addEventListener(MouseEvent.MOUSE_DOWN, transMouseDown, false, 0, true);
    			addChild(trans);
    			
    			// Draw track
    			var color:uint = uint(Ref.getInstance().getRef("categoryCircleColor"));
    			track = new Shape();
    			track.graphics.lineStyle(1, color);
    			track.graphics.lineTo(trackLength, 0);
    			track.y = 6;
    			addChild(track);
    			
    			// Draw scrubber
    			scrubber = new Sprite();
    			scrubber.graphics.beginFill(color);
    			scrubber.graphics.drawRect(0, 0, 80, 13);
    			scrubber.graphics.endFill();
    			center = (trackLength - scrubber.width) >> 1; 
    			scrubber.x = center;
    			addChild(scrubber);
    			
    			// Add dragging functionality
    			scrubber.addEventListener(MouseEvent.MOUSE_DOWN, scrubberMouseDown,false,0,true);
    		}
    
    		private function transMouseDown(event:MouseEvent):void
    		{
    			stage.addEventListener(MouseEvent.MOUSE_UP, stageMouseUpHandler,false,0,true);
    			TweenMax.killTweensOf(scrubber);
    			categoryMenu.preTransition();
    			if (mouseX > width - scrubber.width) scrubber.x = (width - scrubber.width); else scrubber.x = mouseX;
    		}
    
    		/*private function transMouseUp(event:MouseEvent):void
    		{
    			stage.removeEventListener(MouseEvent.MOUSE_UP, stageMouseUpHandler);
    			checkPosition();
    		}*/
    
    		private function scrubberMouseDown(event:MouseEvent):void
    		{
    			event.stopImmediatePropagation();
    			TweenMax.killTweensOf(scrubber);
    			scrubber.startDrag(false, new Rectangle(0, 0, trackLength - scrubber.width, 0));
    			stage.addEventListener(MouseEvent.MOUSE_UP, stageMouseUpHandler,false,0,true);
    			categoryMenu.preTransition();
    		}
    
    		private function stageMouseUpHandler(event:MouseEvent):void
    		{
    			stage.removeEventListener(MouseEvent.MOUSE_UP, stageMouseUpHandler);
    			scrubber.stopDrag();
    			checkPosition();
    		}
    
    		private function checkPosition():void
    		{
    			var targetX:Number = (trackLength - scrubber.width) >> 1; 
    			if (scrubber.x > (center + 20)) categoryMenu.postTransition(1); 
    				else
    			if (scrubber.x < (center - 20)) categoryMenu.postTransition(-1);
    				else 
    				categoryMenu.postTransition(0);
    			TweenMax.to(scrubber, .5, {x:targetX, ease:Quint.easeOut, overwrite:1});
    		}
    		
    		public function nextMenu():void
    		{
    			categoryMenu.postTransition(1);
    		}
    		
    		public function prevMenu():void
    		{
    			categoryMenu.postTransition(-1);
    		}
    	}
    }

I've inserted the code below in my Main.as to call the function which I can't get it success.

    import com.theflashfactor.carouselStackGallery.categoryMenu.CategoryScroller;
    private var categoryScroller:CategoryScroller = new CategoryScroller();
    categoryScroller.nextMenu();

**Main.as**

    package 
    {
    	import com.theflashfactor.carouselStackGallery.CarouselStackGallery;
    	import com.theflashfactor.carouselStackGallery.categoryMenu.CategoryMenu;
    	import com.theflashfactor.carouselStackGallery.categoryMenu.CategoryScroller;
    	
    	import flash.display.Sprite;
    	import flash.display.StageAlign;
    	import flash.display.StageScaleMode;
    	import flash.events.Event;
    	import flash.events.MouseEvent;
    	import flash.geom.Rectangle;
    	
    	import org.casalib.events.LoadEvent;
    	import org.casalib.load.DataLoad;
    	
    	/**
    	 * Main document class 
    	 * @author Rimmon Trieu
    	 */
    	[SWF(frameRate="60", backgroundColor="0", pageTitle="3D Carousel Stack Gallery")]
    	public class Main extends Sprite 
    	{
    		private var xmlPath:String = "../xml/Main.xml";
    		private var ts3:Sprite = new Sprite;
    		private var categoryMenu:CategoryMenu = new CategoryMenu();
    		private var categoryScroller:CategoryScroller = new CategoryScroller();
    		
    		public function Main()
    		{
    			stage.align = StageAlign.TOP_LEFT;
    			stage.scaleMode = StageScaleMode.NO_SCALE;
    			addEventListener(Event.ADDED_TO_STAGE, addToStage);
    		}
    		
    		private function addToStage(event:Event):void
    		{
    			removeEventListener(Event.ADDED_TO_STAGE, addToStage);
    			var xmlLoad:DataLoad = new DataLoad(xmlPath);
    			xmlLoad.addEventListener(LoadEvent.COMPLETE, xmlLoaded);
    			xmlLoad.start();
    			
    			ts3.graphics.beginFill(0x555555,1);
    			ts3.graphics.drawCircle(0, 0, 50);
    			ts3.graphics.endFill();
    		}
    		
    		private function xmlLoaded(event:LoadEvent):void
    		{
    			event.target.removeEventListener(LoadEvent.COMPLETE, xmlLoaded);
    			opaqueBackground = uint(event.target.dataAsXml.settings.@backgroundColor);
    			var gallery:CarouselStackGallery = new CarouselStackGallery(event.target.dataAsXml);
    			addChild(gallery);
    			
    			addChild(ts3);
    			ts3.addEventListener(MouseEvent.MOUSE_DOWN, ts3MouseDown,false,0,true);
    		}
    		
    		private function ts3MouseDown(event:MouseEvent):void
    		{
    			categoryScroller.nextMenu();
    		}
    	}
    }
How to call one of the function from this class?
===

I wanna call the function "**nextMenu**" & "**prevMenu**" from this class from Main.as
But I get the error 1136. Can help me see what I've left out on the codes?

**CategoryScroller.as**

    package com.theflashfactor.carouselStackGallery.categoryMenu
    {
    	import com.greensock.TweenMax;
    	import com.greensock.easing.Quint;
    	import com.theflashfactor.utils.Ref;
    	
    	import flash.display.Shape;
    	import flash.display.Sprite;
    	import flash.events.MouseEvent;
    	import flash.geom.Rectangle;
    	
    	/**
    	 * Scroller to switch view for category item if there are more than visibleItem available 
    	 * @author Rimmon Trieu
    	 */
    	public class CategoryScroller extends Sprite
    	{
    		private var trackLength:int = 400;
    		private var scrubber:Sprite;
    		private var track:Shape;
    		private var categoryMenu:CategoryMenu;
    		private var trans:Sprite;
    		private var center:Number;
    		
    		public function CategoryScroller(categoryMenu:CategoryMenu)
    		{
    			this.categoryMenu = categoryMenu;
    			buttonMode = true;
    			initialize();
    		}
    		
    		/**
    		 * Draw elemnt scrubber and track 
    		 */
    		private function initialize():void
    		{
    			trans = new Sprite();
    			trans.graphics.beginFill(0, 0);
    			trans.graphics.drawRect(0, 0, trackLength, 13);
    			trans.graphics.endFill();
    			trans.addEventListener(MouseEvent.MOUSE_DOWN, transMouseDown, false, 0, true);
    			addChild(trans);
    			
    			// Draw track
    			var color:uint = uint(Ref.getInstance().getRef("categoryCircleColor"));
    			track = new Shape();
    			track.graphics.lineStyle(1, color);
    			track.graphics.lineTo(trackLength, 0);
    			track.y = 6;
    			addChild(track);
    			
    			// Draw scrubber
    			scrubber = new Sprite();
    			scrubber.graphics.beginFill(color);
    			scrubber.graphics.drawRect(0, 0, 80, 13);
    			scrubber.graphics.endFill();
    			center = (trackLength - scrubber.width) >> 1; 
    			scrubber.x = center;
    			addChild(scrubber);
    			
    			// Add dragging functionality
    			scrubber.addEventListener(MouseEvent.MOUSE_DOWN, scrubberMouseDown,false,0,true);
    		}
    
    		private function transMouseDown(event:MouseEvent):void
    		{
    			stage.addEventListener(MouseEvent.MOUSE_UP, stageMouseUpHandler,false,0,true);
    			TweenMax.killTweensOf(scrubber);
    			categoryMenu.preTransition();
    			if (mouseX > width - scrubber.width) scrubber.x = (width - scrubber.width); else scrubber.x = mouseX;
    		}
    
    		/*private function transMouseUp(event:MouseEvent):void
    		{
    			stage.removeEventListener(MouseEvent.MOUSE_UP, stageMouseUpHandler);
    			checkPosition();
    		}*/
    
    		private function scrubberMouseDown(event:MouseEvent):void
    		{
    			event.stopImmediatePropagation();
    			TweenMax.killTweensOf(scrubber);
    			scrubber.startDrag(false, new Rectangle(0, 0, trackLength - scrubber.width, 0));
    			stage.addEventListener(MouseEvent.MOUSE_UP, stageMouseUpHandler,false,0,true);
    			categoryMenu.preTransition();
    		}
    
    		private function stageMouseUpHandler(event:MouseEvent):void
    		{
    			stage.removeEventListener(MouseEvent.MOUSE_UP, stageMouseUpHandler);
    			scrubber.stopDrag();
    			checkPosition();
    		}
    
    		private function checkPosition():void
    		{
    			var targetX:Number = (trackLength - scrubber.width) >> 1; 
    			if (scrubber.x > (center + 20)) categoryMenu.postTransition(1); 
    				else
    			if (scrubber.x < (center - 20)) categoryMenu.postTransition(-1);
    				else 
    				categoryMenu.postTransition(0);
    			TweenMax.to(scrubber, .5, {x:targetX, ease:Quint.easeOut, overwrite:1});
    		}
    		
    		public function nextMenu():void
    		{
    			categoryMenu.postTransition(1);
    		}
    		
    		public function prevMenu():void
    		{
    			categoryMenu.postTransition(-1);
    		}
    	}
    }

I've inserted the code below in my Main.as to call the function which I can't get it success.

    import com.theflashfactor.carouselStackGallery.categoryMenu.CategoryScroller;
    private var categoryScroller:CategoryScroller = new CategoryScroller();
    categoryScroller.nextMenu();

**Main.as**

    package 
    {
    	import com.theflashfactor.carouselStackGallery.CarouselStackGallery;
    	import com.theflashfactor.carouselStackGallery.categoryMenu.CategoryMenu;
    	import com.theflashfactor.carouselStackGallery.categoryMenu.CategoryScroller;
    	
    	import flash.display.Sprite;
    	import flash.display.StageAlign;
    	import flash.display.StageScaleMode;
    	import flash.events.Event;
    	import flash.events.MouseEvent;
    	import flash.geom.Rectangle;
    	
    	import org.casalib.events.LoadEvent;
    	import org.casalib.load.DataLoad;
    	
    	/**
    	 * Main document class 
    	 * @author Rimmon Trieu
    	 */
    	[SWF(frameRate="60", backgroundColor="0", pageTitle="3D Carousel Stack Gallery")]
    	public class Main extends Sprite 
    	{
    		private var xmlPath:String = "../xml/Main.xml";
    		private var ts3:Sprite = new Sprite;
    		private var categoryMenu:CategoryMenu = new CategoryMenu();
    		private var categoryScroller:CategoryScroller = new CategoryScroller();
    		
    		public function Main()
    		{
    			stage.align = StageAlign.TOP_LEFT;
    			stage.scaleMode = StageScaleMode.NO_SCALE;
    			addEventListener(Event.ADDED_TO_STAGE, addToStage);
    		}
    		
    		private function addToStage(event:Event):void
    		{
    			removeEventListener(Event.ADDED_TO_STAGE, addToStage);
    			var xmlLoad:DataLoad = new DataLoad(xmlPath);
    			xmlLoad.addEventListener(LoadEvent.COMPLETE, xmlLoaded);
    			xmlLoad.start();
    			
    			ts3.graphics.beginFill(0x555555,1);
    			ts3.graphics.drawCircle(0, 0, 50);
    			ts3.graphics.endFill();
    		}
    		
    		private function xmlLoaded(event:LoadEvent):void
    		{
    			event.target.removeEventListener(LoadEvent.COMPLETE, xmlLoaded);
    			opaqueBackground = uint(event.target.dataAsXml.settings.@backgroundColor);
    			var gallery:CarouselStackGallery = new CarouselStackGallery(event.target.dataAsXml);
    			addChild(gallery);
    			
    			addChild(ts3);
    			ts3.addEventListener(MouseEvent.MOUSE_DOWN, ts3MouseDown,false,0,true);
    		}
    		
    		private function ts3MouseDown(event:MouseEvent):void
    		{
    			categoryScroller.nextMenu();
    		}
    	}
    }