Open a child form from another child form.

The Scene: I'm working on an app in which the user chooses an option on one child form, which opens another child form. (Hint: both of these child forms are children of a Main Form. User clicks File/New on Main Menu of Main Form, which opens the first child form, which in turn opens a second child form.)

The step by step:

1. On MainForm, user clicks File/New Project from Main Menu. A child form called "Choose a project type" pops up on the screen. The user selects a project option on this form, clicks OK button, the "Choose a project type" child form disappears and a new child form called "Project 1" appears.

Problem: The "Project 1" child form isn't a child of Main Form like it's supposed to be. How do I fix that?