title: How to show 'pagingtoolbar' when the window size changed in Extjs?
body: <p>This question is about the pagingtoolbar layout.
  My target is to show it at the bottom of window whenever the window size changed.
  But now when reduce window size the toolbar is hidden.
  pageingtoolbar codes:</p>
  
  <pre><code>{
      xtype:'pagingtoolbar',
      store:'Users',
      dock:'bottom',
      displayInfo:true
  }
  </code></pre>