Stay on page after MessageBox appears

Okay, so I am using NSDialogs to create a page. I made it so that it if a radio button from the page is not selected, it will display a MessageBox saying that you need to choose one of the choices. The problem is that I want the user to stay on the custom page and not move on to the next. How do I do this? I couldn't find this in the docs, or on Google 😕. Please help!

Thank you.

Use "Abort" in your leave function.

Thank you! It worked!🙂🙂