design error after ajax request

design error after ajax request

widget not get an update within a select fieldcontain after ajax request.

asin did something after the ajax call:

<div data-role='fieldcontain' >
        <label for="color">color</label>
         <select id='color'  class='color' name='color' >
                <option value="1">blue</option>
                <option value='2'>red</option>
         </select>
 </div>














this the the php I bring with ajax,

$('select.color').selectmenu();




this is the way I try to create the widget.



some help please?