title: Customize a dojo's ComboBox
body: <p>How to add/replace some picture at the ▼ sign of <em>dijit.form.ComboBox</em> or <em>dijit.form.FilteringSelect</em> </p>
  
  <p>and the picture can switch when mouse move in  and move out.</p>
  
  <p>And how to change popup's bg-color of the ComboBox.</p>
  
  <p><a href="http://logistics.nostramap.com/" rel="nofollow">Like this web site</a> </p>
  
  <p>(I need to copy like the original from that site. But this site use a custom widget then I don't know how to get the source.)</p>
  
  <p>If anyone know how to customize like that please teach me. Thanks.</p>