Horizontal scrollbar not working on select tag

I am trying to set the horizontal scrollbars on a select tag which is not working.

Here's the code:

  <select style="height: 250px; width: 300px; overflow: auto;" 
  id="dnn_ctr459_ManageRelatedProducts_lstFrom" multiple="multiple"   
  name="dnn$ctr459$ManageRelatedProducts$lstFrom" class="selectList" size="4">
   开发者_运维问答  <option value="9">33 Uithoeke</option>
     <option value="10">Aantekeninge by Koos Prinsloo</option>
     <option value="11">Aantekeninge by Koos Prinsloo (enhanced e-book)</option>
     <option value="12">Access to Social Security</option>
     <option value="13">Angling for Interpretation</option>
  </select>

.selectList 
{
   height: 250px;
   overflow: auto;
   width: 300px;
}

Matt's solution results in this:

Final result in FF

Final result in IE, thanks to Matt!

Not sure if you can do that, but you can always trick it into looking like that by placing a div around the select, and setting the width and horizontal scroll on that. Taken from here.

You cannot force scrollbars on select elements.

Yes, you can. Try it with JQuery:

<div id='test' style="overflow-x:scroll; width:120px; overflow: -moz-scrollbars-horizontal;">
<select id='mySelect' name="mySelect" size="5">
    <option value="1">one two three four five six</option>
    <option value="2">seven eight</option>
    <option value="3">nine ten</option>
    <option value="1">one two three four five six</option>
    <option value="2">seven eight</option>
    <option value="3">nine ten</option>
    <option value="1">one two three four five six</option>
    <option value="2">seven eight</option>
    <option value="3">nine ten</option>
    <option value="1">one two three four five six</option>
    <option value="2">seven eight</option>
    <option value="3">nine ten</option>
</select>
<div id="divv" style='font-size: 1px'>&nbsp</div>
</div>

<script>
    $('#divv').css('width', $('#mySelect').outerWidth());
    $('#mySelect').css('width', $('#test').outerWidth());
    $( "#test" ).scroll(function() {
        $('#mySelect').css('width', $(this).outerWidth() + $(this).scrollLeft());
    });
</script>