title: How to horizontally align a button in a panel with dynamic size
body: <p><a href="http://jsfiddle.net/jxTUw/7/" rel="nofollow"><strong>Here</strong></a> is my jsFiddle simple case as a starter for you. </p>
  
  <p>I want the <code>create</code> button stay in the center of the west pane as my drag the resize bar. </p>
  
  <p>Thanks,</p>