title: How to add a wx.BoxSizer border?
body: <p>what is the most simplest way to add a black border around some widgets using the <code>wx.BoxSizer</code> property like this image below? i am currently learning how to use box sizer to implement in my application.</p>
  
  <p><img src="https://i.stack.imgur.com/sdBi0.png" alt="Layout with Box Sizer"></p>
  
  <p>Here is my code:</p>
  
  <p><a href="http://pastebin.com/cVzqh86M" rel="nofollow noreferrer">http://pastebin.com/cVzqh86M</a></p>