[Action Script] Can't access my class's content. May,2012

Hi

I have created a video player skin Class, that implements an Interface IPlayerSkin, that will allow me to swap out video player skins at run-time. I have this situation where I can't access the contents of my skin class from another class and I can't figure out why, should be pretty straightforward process. Maybe another set of eyes will know know what I am missing here.

For now I am keeping it simple just trying to get a trace of the contents of my skin class from another class. When I run the code from the CleanSkin.fla it traces correctly and shows that the controls MovieClip in the Skin class contains 7 children. When I run the code from the other class Test.fla it throws an error
TypeError: Error #1009: Cannot access a property or method of a null object reference.

Which means it can't see the controls MovieClip in the Skin class for some reason

I have attached is zip file with all the necessary files. And here is some code for the Skin class, the Interface class and the other class (Test.as)

CleanSkin.as
Code: package com.ui.skins{
       
        import flash.display.Bitmap;
        import flash.display.MovieClip;
        import flash.text.TextField;

        public class CleanSkin extends MovieClip implements IPlayerSkin {
               
                public var controls:MovieClip;
               
                //////////////////////////////////////////////////////////
                //
                // IPlayerSkin Properties
                //
                //////////////////////////////////////////////////////////
                private var _loader_icon:Bitmap;
                private var _hover_image:Bitmap;
                private var _background:Bitmap;
                private var _base:MovieClip;
                private var _track:Bitmap;
                private var _progress_Bar:Bitmap;
                private var _seek_btn:Bitmap;
                private var _playPause_Btn:Bitmap;
                private var _stop_Btn:Bitmap;
                private var _mute_btn:Bitmap;
                private var _volume_slider:Bitmap;
                private var _fullscreen_btn:Bitmap;
                private var _playlist_btn:Bitmap;
                private var _playhead_time_txt:TextField;
                private var _duration_txt:TextField;
               
                public function get loader_icon():Bitmap { return _loader_icon; }
                public function set loader_icon(value:Bitmap):void { _loader_icon = value; }
                public function get hover_image():Bitmap { return _hover_image; }
                public function set hover_image(value:Bitmap):void { _hover_image = value; }
                public function get background():Bitmap { return _background; }
                public function set background(value:Bitmap):void { _background = value; }
                public function get base():MovieClip { return _base; }
                public function set base(value:MovieClip):void { _base = value; }
                public function get track():Bitmap { return _track; }
                public function set track(value:Bitmap):void { _track = value; }
                public function get progress_Bar():Bitmap { return _progress_Bar; }
                public function set progress_Bar(value:Bitmap):void { _progress_Bar = value; }
                public function get seek_btn():Bitmap { return _seek_btn; }
                public function set seek_btn(value:Bitmap):void { _seek_btn = value; }
                public function get playPause_Btn():Bitmap { return _playPause_Btn; }
                public function set playPause_Btn(value:Bitmap):void { _playPause_Btn = value; }
                public function get stop_Btn():Bitmap { return _stop_Btn; }
                public function set stop_Btn(value:Bitmap):void { _stop_Btn = value; }
                public function get mute_btn():Bitmap { return _mute_btn; }
                public function set mute_btn(value:Bitmap):void { _mute_btn = value; }
                public function get volume_slider():Bitmap { return _volume_slider; }
                public function set volume_slider(value:Bitmap):void { _volume_slider = value; }
                public function get fullscreen_btn():Bitmap { return _fullscreen_btn; }
                public function set fullscreen_btn(value:Bitmap):void { _fullscreen_btn = value; }
                public function get playlist_btn():Bitmap { return _playlist_btn; }
                public function set playlist_btn(value:Bitmap):void { _playlist_btn = value; }
                public function get playhead_time_txt():TextField { return _playhead_time_txt; }
                public function set playhead_time_txt(value:TextField):void { _playhead_time_txt = value; }
                public function get duration_txt():TextField { return _duration_txt; }
                public function set duration_txt(value:TextField):void { _duration_txt = value; }
                       
               
                public function CleanSkin() {
                        trace("This is the CleanSkin class");
                        trace("The controls MovieClip contains " + this.controls.numChildren + " children");
                }       
        }
}
IPlayerSkin.as
Code: package com.ui.skins{
       
        import flash.display.Bitmap;
        import flash.display.MovieClip;
        import flash.text.TextField;

        public interface IPlayerSkin {
               
                function set background(graphic:Bitmap):void
                function get background():Bitmap
                function set base(graphic:MovieClip):void
                function get base():MovieClip
                function set track(graphic:Bitmap):void
                function get track():Bitmap
                function set progress_Bar(graphic:Bitmap):void
                function get progress_Bar():Bitmap
                function set seek_btn(graphic:Bitmap):void
                function get seek_btn():Bitmap
                function set playPause_Btn(graphic:Bitmap):void
                function get playPause_Btn():Bitmap
                function set stop_Btn(graphic:Bitmap):void
                function get stop_Btn():Bitmap
                function set mute_btn(graphic:Bitmap):void
                function get mute_btn():Bitmap
                function set volume_slider(graphic:Bitmap):void
                function get volume_slider():Bitmap
                function set fullscreen_btn(graphic:Bitmap):void
                function get fullscreen_btn():Bitmap
                function set playlist_btn(graphic:Bitmap):void
                function get playlist_btn():Bitmap
                function set playhead_time_txt(graphic:TextField):void
                function get playhead_time_txt():TextField
                function set duration_txt(graphic:TextField):void
                function get duration_txt():TextField
                function set loader_icon(graphic:Bitmap):void
                function get loader_icon():Bitmap
                function set hover_image(graphic:Bitmap):void
                function get hover_image():Bitmap
        }
}Test.as
Code: package com {
       
        import flash.display.MovieClip;
        import com.ui.skins.*;

       
        public class Test extends MovieClip {
               
                private var _skin:CleanSkin;
               
                public function Test() {
                        _skin = new CleanSkin();
                        trace("Skin has " + _skin.numChildren + " children.");
                }
        }
}
Attached Files PlayerSkin.zip (78.9 KB)
Can't access my class's content.

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