title: How to open in a new window a custom action in grocery crud?
body: <p>What I want to do is that when I click the custom action in a table rendered using grocery crud it will open in a new window.</p>
  
  <pre><code>public function list() {
          try {
              $crud = new grocery_CRUD();
  
              $crud-&gt;set_theme('flexigrid');
              $crud-&gt;set_table('employee');
  
              $crud-&gt;add_action('Create Payslip', base_url().'design/images/img.png', 'roll/emp');
  
              $output = $crud-&gt;render();
  
              $this-&gt;output($output);
          } catch(Exception $e) {
              show_error($e-&gt;getMessage().' --- '.$e-&gt;getTraceAsString());
          }
      }
  </code></pre>
  
  <p>What should I add?</p>