title: Possibility of opening an extension within another extension in Autodesk Forge
body: <p>Is it possible to open a custom extension thorough another custom extension ?</p>
  <p>I tried but I get issues at the time of &quot;<strong>Autodesk.Viewing.UI.DockingPanel.call</strong>&quot; not sure whether I have done it properly or it is possible at all .</p>
  <p>My use case :</p>
  <p>I need to create a report, which contains some additional data that needed to enter at runtime plus a screenshot of the current view.( for this i have one extension).</p>
  <p>Above extension need to open through markup extension so I can add annotation and save the screenshot.
  Cheers</p>
  <p><strong>edit</strong></p>
  <p>is it possible to add a custom extension to a core extension as well ?</p>
  <pre class="lang-js prettyprint-override"><code>viewer.loadExtension(&quot;Autodesk.Viewing.MarkupsGui&quot;).then(function (extension_)
  {
      viewer.loadExtension('CreateNcrExtension');
  });
  </code></pre>
  <p>This actually doesn't work . No error but wont load as well</p>