title: Dropdown OnSelect and OnChange Actions not firing
body: <p>I added a textbox called <code>TextBox1</code> to my <code>PowerApps</code> form.</p>
  
  <p>Then in the <code>OnSelect</code> and <code>OnChange</code> Actions/Events I add the following code</p>
  
  <pre><code>TextBox1.Text="Hallo world"
  </code></pre>
  
  <p>When I run the app and change the select values in the dropdown then the textbox text does not change.</p>
  
  <p>Why does the <code>OnChange</code> or <code>OnSelect</code> events not get triggered?</p>