function Row(index, x, y) {
                            this.x = null;
                            this.y = null;
                            this.a = null;
                            this.b = null;
                            this.c = null;
                            this.d = null;
                            this.formulaA = null;
                            this.formulaE = null;
                            this.index = 0;
                            this.index = index;
                            this.x = x;
                            this.y = y;
                        }
@param {com.mxgraph.io.mxGraph} graph
@param {com.mxgraph.io.vsdx.mxVsdxPage} page
@return {string}