DocumentClass extend problem

Code:

package 
{
    import com.gskinner.motion.GTweenFilter;
    import flash.display.MovieClip;
    import com.gskinner.motion.GTween;
    import flash.filters.GlowFilter;
    import fl.motion.easing.*;
    import flash.events.MouseEvent;
    
    import flash.events.Event;
    import flash.display.Stage;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    
    /**
     * ...
     * @author 
     */
    
    
    public class NekoIme extends MovieClip 
    {
        //Main elemnets
        public var portfolio:Portfolio;
        
        //Measurement variables
        public static var sirina:Number;
        public var visina:Number;
        public var centarX:Number;
        public var centarY:Number;
        
        // Main buttons variables
        public var portfolioButton:PortfolioBtn = new PortfolioBtn();
        public var blogButton:BlogBtn = new BlogBtn();
        public var sandButton:SandBtn = new SandBtn();
        
        //Graphic assets variables
        public var logoBar:LogoBar = new LogoBar();
        
        //filters variables
        public var buttonYellowGlow:GlowFilter = new GlowFilter(0xFFFF00, 0, 0, 0,1);
        public var buttonRedGlow:GlowFilter = new GlowFilter(0xFF0000, 0, 0, 0, 1);
         
        
        public function NekoIme()
        {
            addEventListener(Event.ADDED_TO_STAGE, onStage);
        }
        
        public function onStage(e:Event):void
        {
            removeEventListener(Event.ADDED_TO_STAGE, onStage);
            setStage();
        }
        
        public function setStage():void
        {
            stage.align = StageAlign.TOP_LEFT;
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.addEventListener(Event.RESIZE, onStageResize, false, 0, true);
            
            centarX = stage.stageWidth / 2;
            centarY = stage.stageHeight / 2;
            sirina = stage.stageWidth;
            visina = stage.stageHeight;
            
            addItems();
            PositionItemsIndexState();
        }
        
        public function onStageResize(e:Event):void
        {
            centarX = stage.stageWidth / 2;
            centarY = stage.stageHeight / 2;
            sirina = stage.stageWidth;
            visina = stage.stageHeight;

            PositionItemsIndexState();
            
        }
        
        public function addItems():void
        {
            logoBar.x = centarX;
            logoBar.y = -500;
            addChild(logoBar);
            
            portfolioButton.x = -100;
            portfolioButton.y = centarY;
            
            blogButton.x = centarX;
            blogButton.y = visina+100;
            
            sandButton.x = sirina+100;
            sandButton.y = centarY;
            
            addChild(portfolioButton);
            addChild(blogButton);
            addChild(sandButton);
            
            portfolioButton.filters = [buttonYellowGlow, buttonRedGlow];
            blogButton.filters = [buttonYellowGlow, buttonRedGlow];
            sandButton.filters = [buttonYellowGlow, buttonRedGlow];
            
            portfolioButton.addEventListener(MouseEvent.MOUSE_OVER, onPortfolioButtonOver);
            portfolioButton.addEventListener(MouseEvent.MOUSE_OUT, onPortfolioButtonOut);
            portfolioButton.addEventListener(MouseEvent.CLICK, onPortfolioButtonClicked);
            
            blogButton.addEventListener(MouseEvent.MOUSE_OVER, onBlogButtonOver);
            blogButton.addEventListener(MouseEvent.MOUSE_OUT, onBlogButtonOut);
            blogButton.addEventListener(MouseEvent.CLICK, onBlogButtonClicked);
            
            sandButton.addEventListener(MouseEvent.MOUSE_OVER, onSandButtonOver);
            sandButton.addEventListener(MouseEvent.MOUSE_OUT, onSandButtonOut);
            sandButton.addEventListener(MouseEvent.CLICK, onSandButtonClicked);
        }
        
        public function PositionItemsIndexState():void
        {
            new GTween(logoBar, 2, { x:centarX, y:149 }, { ease:Sine.easeOut } )
            new GTween(portfolioButton, 3, { x:centarX - 200, y:centarY }, { ease:Back.easeOut });
            new GTween(blogButton, 3, { x:centarX-35, y:centarY }, { ease:Back.easeOut });
            new GTween(sandButton, 3, { x:centarX+130, y:centarY }, { ease:Back.easeOut });
        }
            
        
        public function PositionItemsPortfolioState():void
        {
            new GTween(logoBar, 2, { x:centarX, y:-125 }, { ease:Sine.easeIn } )
            new GTween(portfolioButton, 3, { x:sirina - 360, y:30 }, { ease:Back.easeInOut } );
            new GTween(blogButton, 3, { x:sirina-240, y:30  }, { ease:Back.easeInOut, delay:1.5 } );
            new GTween(sandButton, 3, { x:sirina-120, y:30 }, { ease:Back.easeInOut, delay:3 } );
        }
        
        
        
        
        
        
        
        
        //click handlers
        //===================================================================================================
        public function onPortfolioButtonOver(e:MouseEvent):void
        {
            new GTweenFilter(e.target, 1, { color:0xFFFF00, alpha:1, blurX:15, blurY:10, strength:1 }, { filterIndex:0 } );            
            new GTweenFilter(e.target, 1, { color:0xFF0000, alpha:1, blurX:20, blurY:15, strength:1 }, { filterIndex:1 } );            
        }
        
        public function onPortfolioButtonOut(e:MouseEvent):void
        {
            new GTweenFilter(e.target, 1, { color:0xFFFF00, alpha:0, blurX:0, blurY:0, strength:0 }, { filterIndex:0 } );            
            new GTweenFilter(e.target, 1, { color:0xFF0000, alpha:0, blurX:0, blurY:0, strength:0 }, { filterIndex:1 } );            
        }
        
        public function onPortfolioButtonClicked(e:MouseEvent):void
        {
            PositionItemsPortfolioState();
            portfolio = new Portfolio();
            addChild(portfolio);
        }
        
        public function onBlogButtonOver(e:MouseEvent):void
        {
            new GTweenFilter(e.target, 1, { color:0xFFFF00, alpha:1, blurX:15, blurY:10, strength:1 }, { filterIndex:0 } );            
            new GTweenFilter(e.target, 1, { color:0xFF0000, alpha:1, blurX:20, blurY:15, strength:1 }, { filterIndex:1 } );            
        }
        
        public function onBlogButtonOut(e:MouseEvent):void
        {
            new GTweenFilter(e.target, 1, { color:0xFFFF00, alpha:0, blurX:0, blurY:0, strength:0 }, { filterIndex:0 } );            
            new GTweenFilter(e.target, 1, { color:0xFF0000, alpha:0, blurX:0, blurY:0, strength:0 }, { filterIndex:1 } );    
        }
        
        public function onBlogButtonClicked(e:MouseEvent):void
        {
            
        }
        
        public function onSandButtonOver(e:MouseEvent):void
        {
            new GTweenFilter(e.target, 1, { color:0xFFFF00, alpha:1, blurX:15, blurY:10, strength:1 }, { filterIndex:0 } );            
            new GTweenFilter(e.target, 1, { color:0xFF0000, alpha:1, blurX:20, blurY:15, strength:1 }, { filterIndex:1 } );            
        }
        
        public function onSandButtonOut(e:MouseEvent):void
        {
            new GTweenFilter(e.target, 1, { color:0xFFFF00, alpha:0, blurX:0, blurY:0, strength:0 }, { filterIndex:0 } );            
            new GTweenFilter(e.target, 1, { color:0xFF0000, alpha:0, blurX:0, blurY:0, strength:0 }, { filterIndex:1 } );            
        }
        
        public function onSandButtonClicked(e:MouseEvent):void
        {            
        }

        
    }
    
}

Code:

package 
{
    import flash.display.MovieClip;
    import NekoIme;
    
    /**
     * ...
     * @author 
     */
    
     
    public class Portfolio extends NekoIme 
    {

        
        public function Portfolio()
        {
            trace("do ovog trace-a ne stize");
        }

    }
    
}