title: how to set radio button checked using knockout.js?
body: <p>I have two radio buttons. </p>
  
  <pre><code>&lt;td&gt;
      &lt;div style="display: inline; margin-right: 10px"&gt;
           &lt;input type="radio" name="USGlobalUser" data-bind:"checked:IsGlobal/&gt;US
      &lt;/div&gt;
      &lt;div style="display: inline"&gt;
           &lt;input type="radio" name="USGlobalUser" data-bind:"checked:IsGlobal"/&gt;Global
      &lt;/div&gt;
  &lt;/td&gt;
  </code></pre>
  
  <p>I am populating my model like this</p>
  
  <pre><code>QuestionnaireModel = function (data) {
    self.IsGlobal = ko.protectedObservable(data ? data.IsGlobal : false);
  }
  </code></pre>
  
  <p>The value is coming from DB perfectly and its getting populated in self.IsGlobal as true/false. Based upon this true/false, I want to set my radio button checked.</p>