title: how do i get a checkbox column for multi-select into a datagrid?
body: <p>I'm having trouble getting a checkbox column into a VMware Clarity datagrid, or generally getting multi select of rows to work.</p>
  
  <p>I can get single select to work just fine.</p>
  
  <p>I see the example in the VMware Clarity doc:
  <a href="https://vmware.github.io/clarity/documentation/datagrid/batch-action" rel="nofollow noreferrer">https://vmware.github.io/clarity/documentation/datagrid/batch-action</a></p>
  
  <p>I feel like I'm following the directions correctly, but no checkbox column shows up (a radio button column does show if I change it to single select).  </p>
  
  <p>My markup:</p>
  
  <pre><code>&lt;clr-datagrid [(clrDgSelected)]="selected" [clDgRowSelection]="true"&gt;
  
  &lt;clr-dg-action-bar&gt;
      &lt;div class="btn-group"&gt;
          &lt;button type="button" class="btn btn-sm btn-secondary" (click)="onAdd()"&gt;&lt;clr-icon shape="plus"&gt;&lt;/clr-icon&gt; Register&lt;/button&gt;
          &lt;button type="button" class="btn btn-sm btn-secondary" (click)="onDelete()" &gt;&lt;clr-icon shape="close"&gt;&lt;/clr-icon&gt; Delete&lt;/button&gt;
          &lt;button type="button" class="btn btn-sm btn-secondary" (click)="onEdit()" *ngIf="selected?.length == 1"&gt;&lt;clr-icon shape="pencil"&gt;&lt;/clr-icon&gt; Edit&lt;/button&gt;
      &lt;/div&gt;
  &lt;/clr-dg-action-bar&gt;
  
  &lt;clr-dg-column&gt;Name&lt;/clr-dg-column&gt;
  &lt;clr-dg-column&gt;Serial #&lt;/clr-dg-column&gt;
  
  &lt;clr-dg-row *clrDgItems="let networkSystem of networkSystems"  [clrDgItem]="networkSystem"&gt;
      &lt;clr-dg-cell&gt;{{networkSystem.name}}&lt;/clr-dg-cell&gt;
      &lt;clr-dg-cell&gt;{{networkSystem.serial_number}}&lt;/clr-dg-cell&gt;
  &lt;/clr-dg-row&gt;
  
  &lt;/clr-datagrid&gt;
  </code></pre>
  
  <p>I've tried digging through the examples in the Clarity repo, but I can't find this batch selection one anywhere.  (would be nice if the official documentation somehow included the full source both for the angular component and the markup).</p>
  
  <p>Thanks for any help!</p>