title: dijit.form.filteringselect dynamically change options
body: <p>I have a <code>dijit.form.FilteringSelect</code> component and I want to change the options dynamically. But I get the store from the dijit.form.FilteringSelectwith its store property; there is no setter function in the store. (It may be a dojo.store.Reader)</p>
  
  <p>So how can I change the option of <code>dijit.form.FilteringSelect</code>?  Should I change it directly with DOM?  Is there any way to update the store behind <code>dijit.form.FilteringSelect</code>?</p>