public void Add(CanvasDevice device, string str)
        {
            win2d_TextblockString s = new win2d_TextblockString(device, str, DrawingWidth);
            Strings.Add(s);
            _totalstringsheight += s.Height + StringPaddingY;

            if(ScrollToBottomOnAppend)
            {
                ScrollToBottom();
            }
        }
        public void Add(CanvasDevice device, string str)
        {
            win2d_TextblockString s = new win2d_TextblockString(device, str, DrawingWidth);

            Strings.Add(s);
            _totalstringsheight += s.Height + StringPaddingY;

            if (ScrollToBottomOnAppend)
            {
                ScrollToBottom();
            }
        }