VB.NET ~ how can you get a web browser completed?

I created a form with the webbrowser on it. I created another form with a button that will create an instance of that form (with the webbrowser).

How can I setup the document completed on the new instance of the form? I am going to have about 100 of these forms so each instance will have different document completed code to run the site.

What is the best way to call on the document completed section of a web browser from another form?

Thanks