public TableCell(SizeNumber width, SizeNumber height)
     : base(0, 0, 0, 0)
 {
     CellWidth = width;
     CellHeight = height;
     Outline = true;
     FullSize = true;
 }
 public TableRow(SizeNumber height)
     : base(0, 0)
 {
     RowHeight = height;
     Cells = new List<TableCell>();
 }