title: How to uncheck a checkbox in angular2
body: <p>I have code in the HTML file that looks like this</p>
  
  <pre><code> &lt;tr *ngFor="#tradeSource of tradeSources"&gt;
       &lt;td&gt;
           &lt;label&gt;
           &lt;input type="checkbox" ngControl="tradeSource"    [(ngModel)]="tradeSource['checked']"/&gt;
           &lt;/label&gt;
       &lt;/td&gt;           
       &lt;td&gt;{{tradeSource.blah}}&lt;/td&gt;
       &lt;td&gt;{{tradeSource.blah}}&lt;/td&gt;
       &lt;td&gt;{{tradeSource.blah}}&lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>A user can check the check box then click a "Process" button that will run some code, after this code has run I would like to uncheck this checkbox. Ive tried code like</p>
  
  <pre><code>this.tradeSources[i]['checked'] = false
  </code></pre>
  
  <p>But this isnt working</p>