title: How to change combobox store data in ExtJS 4.1
body: <p>I define a combobox like this</p>
  
  <pre>
  {
    xtype: 'combobox',
    emptyText: 'Functions'
    store: [ 'none' ]
  }
  </pre>
  
  <p>then, on some event the store should load new data, so I get the store from the combobox and try this:</p>
  
  <pre>
  oFunctionStore.loadData( ['dothis', 'dothat', 'dosomething' ] );
  </pre>
  
  <p>but after this, the combobox has a dropdown without any visible content, just tiny blank lines.</p>