title: ExtJS5 icons in paging toolbar are not visible
body: <p>I am using extjs 5.0.</p>
  
  <p>I have added a paging toolbar to my grid with the following code inside grid's initComponent
  (Also tried it as a config property)</p>
  
  <pre><code>this.bbar= [{
              xtype: 'pagingtoolbar',
              store: 'MyApp.store.fares.SummaryRemote',
              displayInfo: true
          }];
  </code></pre>
  
  <p>The icons in the toolbar are not visible in the UI. But the icons are actually there. As seen in the below screenshot.If i mouse hover the component, i can see the tooltip and also do click.</p>
  
  <p><img src="https://i.stack.imgur.com/mLfZM.png" alt="enter image description here"></p>
  
  <p>I inspected the dom and couldn't find any issues. Do you have any ideas?</p>
  
  <p><img src="https://i.stack.imgur.com/ZOoYP.png" alt="enter image description here"></p>