Nested Content Tree Using Custom Tree View

I have a tree that is currently a standard content tree; three columns for multiple rows of data.  The basic code is as follows:

<tree
	editable="false"
	id="comicsTree"
	enableColumnDrag="true"
	hidecolumnpicker="true"
	seltype="multiple"
	flex="1">

<treecol id="pub" label="Publisher" flex="2"persist="width ordinal" />
<splitter />
<treecol id="title" label="Title" persist="width ordinal" />
<splitter />
<treecol id="series" label="Series" persist="width ordinal" />



I populate the tree children using JavaScript like this (the data is in an a array called comicsArr).

var formatData = {
  rowCount : comicsArr.length,
  getCellText : function(row,column) {
    var line = comicsArr.split("\t");
      switch (column.id) {
        case "pub":
          return line[0];
        case "title":
          return line[1];
        case "series":
          return line[2];
        default :
          return false;
      } // end switch
    },
  setTree: function(treebox){this.treebox = treebox;},
  isContainer: function(row){return false;},
  isSeparator: function(row){return false;},
  isSorted: function(row){return false;},
  getLevel: function(row){return 0;},
  getImageSrc: function(row,col){return null;},
  getRowProperties: function(row,props){},
  getCellProperties: function(row,col,props){},
  getColumnProperties: function(colid,col,props){}
}

document.getElementById(comicsTree).view=formatData;


This all works fine.  However, what I want to do is modify my tree such that the content is nested.  I.E. - All comics published by Marvel will be nested under the row Marvel.  Likewise, all titles of the same name, say Captain America, will be under the nested row Captain America, listed by Series.

My problem is: how do I get the custom tree view to do this or is it even possible?  I've tried about two dozen different approaches to this and can't get anything to work.  Can anyone out there point me in the right direction?

Thanks in advance,
 - JPR