title: Make Column in dojox.data.datagrid unsortable
body: <p>I have a column that doesn't retrieve any data in my dojox.data.datagrid, however I have placed a custom clickable header. I want to disable sorting on this column so that the triangles dont appear when I try and click the header.</p>
  
  <p>Any ideas how I can achieve this?</p>
  
  <p>Edit to show my code:</p>
  
  <pre><code>dojo.require("dojox.grid.DataGrid"); //FindTask
  dojo.require("dojo.data.ItemFileReadStore"); //FindTask
  dojo.require("esri.tasks.find"); //FindTask
  
  var findTask, findParams;
  var grid, store;
  var searchExtent;
  
  function doFind() {
  
              //Show datagrid onclick of search button and resize the map div.
              dojo.style("map", {
                      "height": "87%"});
              esri.show(datagrid);
              searchExtent = new esri.geometry.Extent ({
              "xmin":-9196258.30121186,"ymin":3361222.57748752,"xmax":-9073959.055955742,"ymax":3442169.390441412,"spatialReference":{"wkid":102100}
              });
  
              map.setExtent(searchExtent);
  
      //Set the search text to the value in the box
      findParams.searchText = dojo.byId("parcel").value;
              grid.showMessage("Loading..."); //Shows the Loading Message until search results are returned.
      findTask.execute(findParams,showResults);
    }
  
    function showResults(results) {
      //This function works with an array of FindResult that the task returns
      map.graphics.clear();
      var symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([98,194,204]), 2), new dojo.Color([98,194,204,0.5]));
  
  
      //create array of attributes
      var items = dojo.map(results,function(result){
        var graphic = result.feature;
        graphic.setSymbol(symbol);
        map.graphics.add(graphic);
        return result.feature.attributes;
      }); 
  
      //Create data object to be used in store
      var data = {
        identifier: "Parcel Identification Number",  //This field needs to have unique values. USES THE ALIAS!!!
        label: "PARCELID", //Name field for display. Not pertinent to a grid but may be used elsewhere.
        items: items
      };
  
       //Create data store and bind to grid.
      store = new dojo.data.ItemFileReadStore({ data:data });
      var grid = dijit.byId('grid');
      grid.setStore(store);
  
      //Zoom back to the initial map extent
      map.setExtent(searchExtent);
  
    }
  
    //Zoom to the parcel when the user clicks a row
    function onRowClickHandler(evt){
      var clickedTaxLotId = grid.getItem(evt.rowIndex).PARCELID;
      var selectedTaxLot;
  
      dojo.forEach(map.graphics.graphics,function(graphic){
        if((graphic.attributes) &amp;&amp; graphic.attributes.PARCELID === clickedTaxLotId){
          selectedTaxLot = graphic;
          return;
        }
      });
      var taxLotExtent = selectedTaxLot.geometry.getExtent();
      map.setExtent(taxLotExtent);
    }
  </code></pre>
  
  <p>HTML:</p>
  
  <pre><code>&lt;!--Data Grid--&gt;
                              &lt;div id="datagrid" dojotype="dijit.layout.ContentPane" region="bottom" splitter="true" style="width:100%; height:125px;"&gt;
                                      &lt;table data-dojo-type="dojox.grid.DataGrid" data-dojo-id="grid"  id="grid" data-dojo-props="rowsPerPage:'5', rowSelector:'20px'"&gt;
                                          &lt;thead&gt;
                                              &lt;tr&gt;
                                                  &lt;th field="Parcel Identification Number" width="10%"&gt;
                          Parcel ID
                                                  &lt;/th&gt;
                                                  &lt;th field="Assessing Neighbornood Code" width ="20%"&gt;
                          Neighborhood Code
                                                  &lt;/th&gt;
                                                  &lt;th field="Property Class Code" width="10%"&gt;
                          Property Class
                                                  &lt;/th&gt;
                                                  &lt;th field="Site Address" width="57%"&gt;
                          Address
                                                  &lt;/th&gt;
                                                  &lt;th field="" width="2%"&gt; &lt;div class="GridCloseIcon" title="Close Grid" onclick="closeGrid();"&gt;&lt;/div&gt;
                                                  &lt;/th&gt;                   
                                              &lt;/tr&gt;
                                          &lt;/thead&gt;
                                      &lt;/table&gt;
                              &lt;/div&gt;
  </code></pre>