Hello, 

I'm not sure to get the business need here. You want the system to automatically fire a Modal window when displaying a specific Section? Without any user interactions? 

What Pega version are you running?

Hi Ricardo,

Perform the following steps. 

1. Create a CSS class as .hiddenbutton in Userworkform. 

 .hiddenbutton {

    display:none !important;

  }

2.  In your section Drag a button and configure like below.

• Go to Actions tab - Add an event Click, Add an Action - Local Action - target as Modal Dialog
• Go to Presentation tab of button and Cell read-write classes - hiddenbutton , Cell readonly classes -hiddenbutton

3.  In your section, at the bottom Drag a new Section - Go to HTML tab of the section- Uncheck Auto generated HTML 

and paste below code. 

<script>

 $( document ).ready(function() {

  $('.hiddenbutton button').click();

});

</script>

This will trigger click event on the button which you have configured,whenever the section loads. 

Incase if you face any problem during configuring, Fell free to reach us out. 

Hello,

You could try calling a Pre-Processing activity in the flow action to show the modal dialog. The activity you can use to display a modal dialog would be "ProcessAction".