title: How to add search icon in Vaadin ComboBox?
body: <p>I have a <code>ComboBox</code> that allows selection of the given items, and an icon that accepts the selection:</p>
  
  <p><img src="https://i.stack.imgur.com/pyTPf.png" alt="mine"></p>
  
  <p>the functionality is all fine. </p>
  
  <p>I'm looking for the effect to get the search icon into the comboBox. like in <a href="https://vaadin.com/icons" rel="nofollow noreferrer">Vaadin Icons</a>:</p>
  
  <p><img src="https://i.stack.imgur.com/2p4ug.png" alt="vaadin"></p>
  
  <p>How is this done?</p>
  
  <p>I tried </p>
  
  <pre><code>comboBox.setIcon(new ThemeResource("search.png"));
  </code></pre>
  
  <p>it didn't do any change. </p>
  
  <p>backend developer here - not good on front-end tools. </p>
  
  <p>//==========================================</p>
  
  <p>EDIT:</p>
  
  <p>one thing i can think of is to make the border of <code>ComboBox</code> disappear (don't know yet how), and make a border on the component that contains both the icon and the <code>comboBox</code>. 
  is there another/better way?</p>