title: Knockout JS clear function ko.observable
body: <p>I would like to remove/clear a field of its bindings.</p>
  
  <pre><code>self.Selected = ko.observable();
  
  "Selected": {
      "ID": 5,
      "Name": "22",
      "Active": true,
      "Temp": "2013-01-28T18:14:48.340Z"
    }
  </code></pre>
  
  <p>self.Selected.remove() --- > error: has no method 'remove'</p>
  
  <p>self.Selected.removeAll();  --> Cannot call method 'removeAll' of undefined </p>
  
  <p>self.Selected.cleanNode()--- > error: has no method 'cleanNode' </p>
  
  <p><a href="http://jsfiddle.net/yvTFN/24/" rel="noreferrer">http://jsfiddle.net/yvTFN/24/</a>    :   so you can see a working example</p>
  
  <p>After you EDIT a name, the  self.update = function will do work, then should clear the property Selected, otherwise, if you click update again (no value), the value will update with empty string.</p>