title: PagingToolbar does not work
body: <p>I am using PagingToolbar to filter my result search, I want do display 20 result per page, but in my grid still display all records.</p>
  
  <p>The bbar in my grid</p>
  
  <pre><code>bbar: Ext.create('Ext.PagingToolbar', 
  store: store,
  pageSize: 20,
  displayInfo : true,
  plugins: Ext.create('Ext.ux.ProgressBarPager', {})
  }),
  </code></pre>
  
  <p>My Store</p>
  
  <pre><code>Ext.define('Mystore', {
  extend: 'Ext.data.Store',
  model: 'Mymodel',
  pageSize: 20,
  autoLoad: true,
  remoteSort: true,
  proxy: {
      type: 'rest',
      url: 'search',
      reader: {
          type: 'json',
          root: 'root',
          idProperty: 'id'
      },
      writer: {
          type: 'json',
          writeAllFields: true
      }
  }
  </code></pre>
  
  <p>});</p>
  
  <p>Anybody could help me ??
  Thanks.</p>