How to call a ui page inside a Catalog client script

[agrod]

Hi,

I created a ui page with html and client script.

Then i created a catalog client script and im using this script to call the ui page, but im getting a Java Script Error, i also tried with new GlideDialogWindow but i got the same Error

var gm = new GlideModal('pop_up_yes_no');
gm.setTitle('My Custom UI Page');
gm.setSize(600, 300); // Optional: width, height
gm.render();