Flash Symbol Container

package
{

    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.BlendMode;
    import flash.display.DisplayObject;
    import flash.geom.ColorTransform;
    import flash.geom.Matrix;

    import mx.core.UIComponent;

    [DefaultProperty("children")]
    public class FlashSymbolContainer extends UIComponent
    {

        private var _children:Array;
        private var childrenDirty:Boolean = false;

        public function get children():Array { return _children; }
        public function set children(value:Array):void
        {
            if(value != null)
            {
                _children = value;
                childrenDirty = true;
                invalidateProperties();
            }
        }
        public function FlashSymbolContainer()
        {
            super();

            width   = 300;
            height  = 200;
        }

        protected override function commitProperties():void
        {
            super.commitProperties();

            if(childrenDirty)
            {
                childrenDirty = false;
                redraw();
            }
        }

        private function redraw():void
        {
            if(_children == null)
                return;

            var len:int = _children.length;
            if(len == 0)
                return;

            for(var index:int = 0; index < len; index++)
            {
                var obj:DisplayObject = _children[index] as DisplayObject;
                if(obj == null)
                {
                    throw new Error("Children must be of type DisplayObject.");
                    return;
                }

                if(obj.parent)
                    obj.parent.removeChild(obj);

                addChild(obj);
            }
        }
    }
}