FairyGUI.Container.AddChild C# (CSharp) Method

        public DisplayObject AddChild(DisplayObject child)
        {
            AddChildAt(child, _children.Count);
            return child;
        }

        protected void LoadFromPackage(string itemURL)
        {
            _contentItem = UIPackage.GetItemByURL(itemURL);

            if (_contentItem != null)
            {
                _contentItem.Load();
                if (_contentItem.type == PackageItemType.Image)
                {
                    _image.texture     = _contentItem.texture;
                    _image.scale9Grid  = _contentItem.scale9Grid;
                    _image.scaleByTile = _contentItem.scaleByTile;
                    _activeObject      = _image;

                    _contentSourceWidth  = _contentItem.width;
                    _contentSourceHeight = _contentItem.height;
                    UpdateLayout();
                }
                else if (_contentItem.type == PackageItemType.MovieClip)
                {
                    if (_movieClip == null)
                    {
                        _movieClip = new MovieClip();
                        if (grayed)
                        {
                            _movieClip.SetGrayed(true);
                        }
                        _container.AddChild(_movieClip);
                    }

                    _contentSourceWidth  = _contentItem.width;
                    _contentSourceHeight = _contentItem.height;

                    _movieClip.interval = _contentItem.interval;
                    _movieClip.SetData(_contentItem.texture, _contentItem.frames);
                    _movieClip.boundsRect   = new Rect(0, 0, _contentSourceWidth, _contentSourceHeight);
                    _movieClip.playing      = _playing;
                    _movieClip.currentFrame = _frame;
                    _activeObject           = _movieClip;

                    UpdateLayout();
                }
                else
                {
                    SetErrorState();
                }
            }
            else
            {
                SetErrorState();
            }
        }