title: Do action after render() method is completed
body: <p>I need to do some action when <code>render()</code> method finished its work and appended all HTML elements to DOM.
  How to subscribe to <code>onRenderEnds</code> event (there is no such event)?
  Can I write my own event outside of slickgrid code and attach it to <code>render()</code> method?</p>
  
  <hr>
  
  <p>There are some events <code>"onScroll", "onViewportChanged"</code> but they happened before <code>render()</code> finished (in some cases).</p>
  
  <hr>
  
  <p>Update:
  I write formatter for column: </p>
  
  <pre><code>formatter: function(row, cell, value, columnDef, dataContext){
      return "&lt;div class='operationList' data-my='" + myData + "'&gt;&lt;/div&gt;";            
  }
  </code></pre>
  
  <p>When grid rendered (applying my formatter) i need to go through all <code>".operationList" divs</code> and convert them to other constructions (based on <code>data-my</code> attribute). I need to replace <code>".operationList" divs</code> with a complex structure with event handlers.</p>