title: selection checkbox for ag-grid table
body: <p>I want to have the selection checkbox for ag-grid with the option below:
  But didn't see the checkbox on the left. Have any idea what else needs to be settings to make the selection checkbox works.</p>
  
  <pre><code>self.appliancesInGroupGridOpts = {
          angularCompileRows: true,
          enableColResize : true,
          rowData: null,
          checkboxSelection: true,
          enableSorting: true,
          columnDefs: [
            {
              valueGetter: 'data.name',
              headerName: $filter('translate')('APPLIANCE.NAME'),
              suppressSizeToFit : true,
              template: '&lt;span class="appliance-name"&gt;{{data.name}}&lt;/span&gt;',
              checkboxSelection: true,
              width: 200
            } ,
             {
              valueGetter: 'data.updated',
              headerName: $filter('translate')('APPLIANCE_GROUP.PUBLISH.MODIFICATION_TIME'),
              suppressSizeToFit : true,
              template: '&lt;span class="appliance-updated"&gt;{{data.updated}}&lt;/span&gt;',
              checkboxSelection: true,
              width: 200
            } 
          ] ,
  </code></pre>