lastColumn = columnId + 1;
lastColumn = columnId + colSpan;
	int createCell(int columnId, int rowSpan, int colSpan )	{		if (columnId == -1)		{			columnId = getNextEmptyCell();		}		ensureSize(columnId + colSpan);		for (int i = 0; i < colSpan; i++)		{			columns[columnId + i] = rowSpan;		}		lastColumn = columnId + 1;		if (lastColumn > columnCount)		{			columnCount = lastColumn;		}		return columnId;	}