title: Wicket Palette - Horizontal scrollbar is not shown in firefox
body: <p>At the moment I'm using wicket for an application, I put an palette inside  html page. And everything is fine, but when I insert an option longher then the size of palette I lose half the option string. I solve in Chrome by modifying the following CSS tags</p>
  
  <pre><code>table.palette td.pane select {
      overflow-x: scroll;
      width: 100%;
  }
  </code></pre>
  
  <p>html code:</p>
  
  <pre><code>&lt;select class="choicesSelect" name="destinatari:choices" id="choices3f" multiple="multiple" size="20" onfocus="Wicket.Palette.choicesOnFocus('choices3f','selection40','recorder3e');" ondblclick="Wicket.Palette.add('choices3f','selection40','recorder3e');"&gt;
  &lt;option value="0000024174"&gt;null|null|null&lt;/option&gt;
  &lt;option value="0000026648"&gt;null|null|null&lt;/option&gt;
  &lt;option value="0000008473"&gt;ZWINA|ROMA | null&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/N4LVD.jpg" rel="nofollow noreferrer">click here to see html code and css</a></p>
  
  <p>but firefox does not seem to recognize these instructions.
  how can i fix my problem? (I need to show a vertical and horizontal scrollbar).</p>