jQuery Mobile displays hidden select element

See this select element with display:none. In jQuery Mobile it is displayed despite this:

<select id="dddd" name="dddd"
        data-mini="true" data-native-menu="false" data-theme="c"
        onChange=""
        style="display:none">     
  <option value="1">An optinos</option>
</select>

I'm trying to show/hide jQuery Mobile select elements dependent on other user actions hence why I'm doing the above.

Any ideas?