apps_views_posts_show.phtml

<?php echo $this->widgets->create('dialog')->render(array(
  "name" => "dialog", 
  "title" => "Basic dialog", 
  "content" => "This is the default dialog which is useful for displaying information. The dialog window can be moved, resized and closed with the 'x' icon."
)) ?>

library_Widgets_Dialog.php

<?php

//http://jqueryui.com/dialog/

namespace MyApp\Widgets;

class Dialog 
{
  
  public function render($options)
  {
    echo "<div id="{$options['name']}" title="{$options['title']}"><p>{$options['content']}.</p></div>";
    echo '<script>$(function() {$( "#'.{$options['name']}.'" ).dialog();});</script>';
  }

}

public_index.php

<?php

$di->set('widgets', function($name){
  $widgetClass = 'MyApp\Widgets\\' . $name;
  $widget = new $widgetClass();
  return $widget;
});

Hi,
Is it useable for now? Can I try it?