title: Center the vertical middle of displayfield and button in hbox
body: <p>Please help me vertically center the button with the label and value.  Why does "align: 'middle'" not cause the button text to appear at the same level as the displayfield content?</p>
  
  <p><a href="https://fiddle.sencha.com/#fiddle/1et9" rel="nofollow">https://fiddle.sencha.com/#fiddle/1et9</a></p>