title: th:classappend for appending more than one class
body: <p>I have a scenario that if a condition is equal to particular value i need to append two classes. I was trying using th:classappend and didn't work. This is what i have tried,</p>
  
  <pre><code>&lt;button type="button" class="btn btn-xs" th:classappend="${test.flg== 'A'} ? btn-success anchorDisable : btn-default" &gt;ON&lt;/button&gt;
  </code></pre>
  
  <p>In the above code, if flag == 'A' i need to append these two classes btn-success, anchorDisable. Can anyone take a look on my code and help me to solve this. Thanks</p>