Issue occurred when using constructor-prototype pattern

Question

In the below code, I would like to create a table. I have created the table with ppCreateTable() function. But I am unable to access row() function. Can someone tell me how to access row() function?

var ppElement=function(str_elmt){
      this.tagName=str_elmt;
      return this.ppCreate();
    };
    ppElement.prototype={
      constructor:ppElement,
      ppCreate:function(){
        return document.createElement(this.tagName);
      },
      ppAppend:function(){
        var prntObj=arguments[0];
        for(var i=1;i<arguments.length;i++){
          prntObj.appendChild(arguments[i]);
        }
      },
      ppSetStyle:function(){
       var prntObj=arguments[0];
        prntObj.style.cssText=arguments[1];
      },
     ppWrapper:function(){
       var wrapper_Obj=ppElement.call(this,"div");
       var child_Obj=[];
        child_Obj[0]=wrapper_Obj;
       for(var i=0,j=1;i<arguments.length;i++,j++){
         child_Obj[j]=arguments[i];
       }
        this.ppAppend.apply(this,child_Obj);
        return wrapper_Obj;
     }
    };

    var ppTable=function(row_int,coloumn_int){
    this.row=row_int;
    this.coloumn=coloumn_int;
    return this.ppCreateTable();
    };
    ppTable.prototype=Object.create(ppElement.prototype,{
      constructor:ppTable,
      ppCreateTable:{
        value:function(){
          var tableObj=ppElement.call(this,"div");
          for(var i=0;i<this.row;i++){
           var tableRowObj=ppElement.call(this,"div");
           for(var j=0;j<this.coloumn;j++){
            var tableColumnObj=ppElement.call(this,"div");
            this.ppAppend(tableRowObj,tableColumnObj);
           }
          this.ppAppend(tableObj,tableRowObj);
         }
         return tableObj;
       }
     },
    tableCell:{
     value:function(){
       alert("hi");
     }
    }
    });

    var testTable=new ppTable(2,2);
    testTable.tableCell();
    document.getElementsByTagName('body')[0].appendChild(testTable);