title: Dojo: how to find css definition for digit.form.filteringselect, especially the drop down list?
body: <p>we are using <code>tundra</code> theme. Getting a hard time to find style sheet definition to <code>digit.form.filteringselect</code>, especially to that drop down list area and selected text style<img src="https://i.stack.imgur.com/xWWO7.png" alt="enter image description here"></p>
  
  <h2>UPDATE</h2>
  
  <p>Can anyone tells me what css class in charge of the dropdown menu stylesheet? I need to know because I think this drop down menu can overcome the IE7 z-index issue, I have this <a href="https://stackoverflow.com/questions/17284110/mouseover-css-menu-overlap-with-user-input-text">post</a> to describe previous issue and believe knowing how this dojo component rendered may help me find a clue to fix that issue. Thanks.</p>