title: ExtJS 6 - Bind disabled property to new records in a store
body: <p>I'm trying to enable/disable a button when the store getNewRecords() function return the length, but not work!</p>
  
  <pre><code>bind: {
    disabled: "{!grid.getStore().getNewRecords().length}"
  }
  </code></pre>
  
  <blockquote>
    <p>Fiddle: <a href="https://fiddle.sencha.com/fiddle/1sj5" rel="nofollow noreferrer">https://fiddle.sencha.com/fiddle/1sj5</a></p>
  </blockquote>
  
  <p>Someone have idea to how resolve this?</p>