title: How to change Dropdown to Search Box in Google App Maker
body: <p>I have a datasource "Stock" with a one to one relationship with "Location".</p>
  
  <p>When I drag a form to the canvas for the Stock datasource, it creates a dropdown for the Location. That's fine but there are a lot of Locations, so I want to change the dropdown to a Suggest Box. So, I have added the search box to the form and am trying to use the same options and value parameters that App Maker generated for the dropdown, but App Maker won't let me.</p>
  
  <p>These are the values:</p>
  
  <pre><code>options: datasources.Locations.items
  value: datasource.item.Locations
  </code></pre>
  
  <p>In both cases, the Save button in the editor dialog is disabled.</p>
  
  <p>What am I doing wrong?</p>