title: Changing a single element of the widget style
body: <p>How to change single element of the widget style in GWT. I would like to create new version of TextBox style, so that only the border color changed to red, for example.How to get to the style responsible for the TextBox?</p>
  
  <p>I tried to create new style</p>
  
  <pre><code>.gwt-TextBox.invalid {
  border-color: red;
  }
  </code></pre>
  
  <p>but it does not work.</p>