title: Ag-Grid Tree Structure, change autoGroupColumn to Hide Ids
body: <p>I am using ag-grid to represent a tree structure. In my data each row has an Id and a parent Id and that's how the tree structure is established. Right now when I display Ag-grid it shows this extra column that is the ID of row and as I dig deeper into the tree it will show the related IDs of the children. Is there a way to hide this column? Below is the structure of the data and the gridOptions I am using: </p>
  
  <pre><code>endDate: null
  path: [1, 3, 5]
  id: 4
  level: "a level"
  parentId: 3
  Name: "SomeName"
  runCount: 1
  runNum: 500
  StatusCode: "INITIATED"
  startDate: "2018-11-05 05:20"
  userComment: null
  </code></pre>
  
  <p>The key elements are the id and the related parent id. The path defines the path to get to that element as required by AG-Grid. Below is my grid options.</p>
  
  <pre><code>this.gridOptions = {
    columnDefs: this.detailsColumnDefs,
    rowData: this.detailsRowData,
    treeData: true,
    animateRows: true,
    enableFilter: true,
    enableSorting: true,
    enableColResize: true,
    getDataPath: function(data) {
      return data.path;
    },
    getRowNodeId: function(data) {
      return data.id;
    },
    autoGroupColumnDef: {
      headerName: 'level',
      width: 250,
      hide: true,
      cellRendererParams: {
        suppressCount: true,
      }
    }
  };
  </code></pre>
  
  <p>the autoGroupColumn displays the Id's of each row however, I want it to show the level instead. Is there a way to assign a field to this column group, I would like the level values there instead of id or just remove the id's altogether.</p>