KEEP DYNAMIC BUTTONS DOWN when controlling image gallery

programming flash
1

Hello everyone, please help me on this last part of my project. I’m sure it’s really simple but I can’t seem to figure it out:

I have dynamically loaded buttons (thumb) and images (galImage) going to container_mc and full_mc containers respectively. I can’t get the buttons to stay down when pressed using MOUSE_DOWN and MOUSE_UP. When I use CLICK instead, they all stay pressed. Please help!

        //Load Gallery Images and Thumbs
        for (var i:Number = 0; i < sub_menu1.selectedItem.gallery.length(); i++) 
        {
            //Load Gallery Images
            var galImage:Loader = new Loader();
            var galUrl = sub_menu1.selectedItem.gallery*;
            galImage.load(new URLRequest(galUrl));

            //Create Thumbs
            var thumb = new ThumbButton();
            thumb.image = galImage;
            thumb.name = i;
            thumb.y = 20*y_counter;
            thumb.buttonMode = true;
            
            thumb.graphics.lineStyle(1,0xFFFFFF);
            thumb.graphics.beginFill(0xFFFFFF,0);
            thumb.graphics.drawRect(0,0,15,15);
            thumb.graphics.endFill();
            y_counter++;
    
            //Add Thumbs to Container
            container_mc.addChild(thumb);
    
            thumb.addEventListener(MouseEvent.MOUSE_DOWN, showFull);
            thumb.addEventListener(MouseEvent.MOUSE_UP, stayClear);
            
            function stayClear (ev:Event):void
            {
                ev.target.graphics.clear();
                ev.target.graphics.lineStyle(1,0xFFFFFF);
                ev.target.graphics.beginFill(0xFFFFFF,0);
                ev.target.graphics.drawRect(0,0,15,15);
                ev.target.graphics.endFill();
            }

            function showFull (evt:Event):void
            {
                full_mc.x = 420;
                full_mc.y = 100;
                full_mc.addChild(evt.target.image);

                evt.target.graphics.lineStyle(1,0xFFFFFF);
                evt.target.graphics.beginFill(0xFFFFFF,1);
                evt.target.graphics.drawRect(0,0,15,15);
                evt.target.graphics.endFill();
            }