            rowGridLines[rowStart] = []
        }

        if (!rowGridLines[rowEnd]) {
            rowGridLines[rowEnd] = []
        }

        if (!columnGridLines[colStart]) {
            columnGridLines[colStart] = []
        }

        if (!columnGridLines[colEnd]) {
            columnGridLines[colEnd] = []
        }

        rowGridLines[rowStart].push(name  + '-start')
        rowGridLines[rowEnd].push(name  + '-end')

        columnGridLines[colStart].push(name  + '-start')
        columnGridLines[c