gistfile1.txt

<script type="text/javascript">
  window['midas_setup_container'] = function() {
    $('midas_container_selector').childElements().each(function(element) {
      Event.observe(element, 'click', function(event) {
        event.stop();
        this.execute('insertHTML', {action:'insertHTML', value: '<div class="' + element.getAttribute('data-class') + '"><br/></div>'});
      }.bind(this));
    }.bind(this));
  }
</script>

<div id="midas_container_selector" class="midas-select-content">
  <h3 data-class="col-06">6 Column Container</h3>
  <h3 data-class="col-12">12 Column Container</h3>
</div>