public Rect PayloadRect()
    {
        Rect ret = Config.Rect;

        if (Parent != null)
        {
            ret        = ret.AddTo((Parent as LMS_GuiBaseBox2D).liveRect);
            ret.height = Config.Rect.height;
            ret.width  = Config.Rect.width;
        }
        if (Sibling != null)
        {
            if (Sibling is LMS_GuiBaseVerticalScroller)
            {
                ret.y += (Sibling as LMS_GuiBaseVerticalScroller).Axis.y;
            }
        }
        return(ret);
    }