title: Durandal 2.0.1, Tryactivate getting called again and again
body: <p>I am using Durandal 2.0.1 for my application.</p>
  
  <p>I am using below html code to compose view and viewmodel.</p>
  
  <pre><code>&lt;div id="graphid" data-bind="compose: { model: 'templates/graphControl', view: 'templates/graphControl' }, visible: showGraph"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>The problem which I am facing is that, whenever I am trying to toggle the <strong>visibility</strong> of the above div, <strong>tryactivate</strong> is getting called again and again. Is it the expected behaviour or is there something I am doing wrong.
  Can anyone tell/explain why is this happening, if it is a known behaviour.</p>
  
  <p>Can anyone just explain why is this happening.</p>
  
  <p>Thanks in advance.</p>