public virtual void Remove(UIElement element) { __UIElement _element = element; __FrameworkElement _felement = _element as __FrameworkElement; if (_felement == null) { throw new NotImplementedException(); } if (_felement.InternalParent != this.InternalVisualParent) { return; } InternalSprite.removeChild(_element.InternalGetDisplayObject()); InternalItems.Remove(element); _felement.InternalParent = null; }