<div class="modal fade">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
        <h4 class="modal-title">Modal title</h4>
      </div>
      <div class="modal-body">
        <p>One fine body&hellip;</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div><!-- /.modal-content -->
  </div><!-- /.modal-dialog -->
</div><!-- /.modal -->

The render example is initialized with the following code

rndDialog.addButton({
  key: 'cancel',
  caption: 'Cancel'
}, false, true, 'pull-left');
    
rndDialog.addButton(
  dom.createDom('button', {
      'class': 'btn btn-primary pull-right',
      'name': 'lovely'
    }, dom.createTextNode('Love it '),
    dom.createDom('span', {
      'class': 'glyphicon glyphicon-heart'
    })),
  true);

rndDialog.setTitle('Render demo');
rndDialog.setBodyContent(dom.createDom('p',
  null, 'This is a dynamically created dialog'));