title: Creating a column in KendoGrid that is not bound to datasource
body: <p>I am using Kendo UI to bind a datasource to the Kendo Grid. I am trying to find the best way to create a column in the grid that is <em>not</em> bound to the datasource. </p>
  
  <p>Currently, I am creating a field in the datasource and using some javascript and jQuery to set the values of that column after the data is read from the remote endpoint.</p>
  
  <p>Datasource:</p>
  
  <pre><code>schema: {
      model: {
          fields: {
              blah: {},
              empty_column: {}
          }
      }
  }
  </code></pre>
  
  <p>Grid:</p>
  
  <pre><code>columns: {
      field: "empty_column",
      width: 100,
      title: "Empty"
  }
  </code></pre>
  
  <p>Javascript:</p>
  
  <pre><code>datasource.data[item].set("empty_column", computed_value);
  </code></pre>
  
  <p>All code edited for brevity, it all works fine.  </p>
  
  <p><strong>My question</strong>: is there a way to set the defaultValue for this new, empty column which is not connected to the remote endpoint? 
  When I set:  </p>
  
  <pre><code>empty_column: {defaultValue: "None"}
  </code></pre>
  
  <p>the grid still displays 'undefined', I think because it is not receiveing any data for that field in the read operation. Is there a way to set the defaultValue in the grid? I haven't seen any examples of this...</p>