title: Normal links with ExtJS callbacks?
body: <p>In a renderer I'm generating links, which I want to map to my controllers functions.
  The ActionColumn does this with images somehow, but I don't get the mechanism behind it.
  I would like to have buttons there, but ExtJS only lets me render strings in a grid.</p>
  <p><img src="https://i.stack.imgur.com/7yYFT.png" alt="Here is an example with the links" /></p>