internal override void Attach(LayoutContent model)
        {
            _anchorable = model as LayoutAnchorable;
            _anchorable.IsVisibleChanged += new EventHandler(_anchorable_IsVisibleChanged);

            if (_anchorable.CanClose)
            {
                _anchorable.SetCanCloseInternal(true);
            }

            base.Attach(model);
        }