title: Required module missing methods
body: <p>Is it a bug from UI5 (1.60.2) or I am doing something wrong here? </p>
  
  <pre class="lang-js prettyprint-override"><code>onSelectPreferredTreatment: function(event) {
    // ...
    const oDialog = new Dialog({/*...*/});
    oDialog.open();
  },
  </code></pre>
  
  <blockquote>
    <p>VM77446:1 Uncaught <strong>TypeError: oDialog.open is not a function</strong><br>
      at eval (eval at onSelectPreferredTreatment (Preview.controller.js?eval:NaN), :1:9)<br>
      at f.onSelectPreferredTreatment (Preview.controller.js?eval:552)</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/vSoIf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vSoIf.png" alt="Full structure of oDialog"></a></p>