title: knockoutjs select change event gets fired when binding
body: <p>I have this knockout code: <a href="http://jsfiddle.net/nickbuus/Rwabt/" rel="noreferrer">http://jsfiddle.net/nickbuus/Rwabt/</a></p>
  
  <p>The problem is that whenever the dropdown select box gets filled the change event gets called:</p>
  
  <pre><code> &lt;select data-bind="options: $root.Categories, optionsText: 'categoryName', optionsValue:       'categoryId', value: CatId, optionsCaption: 'Vælg...', event: { change: $root.selectionChanged }"&gt;&lt;/select&gt;
  </code></pre>
  
  <p>How do I fix this ?</p>