And something for the frame, you say?
In any case, the example at the bottom of the hyperlink shows the control
inside the browser.
Forms can not be shown "inside" the browser, only controls, but you can put
tabs/panels, etc. on the control, and show and hide them.
You can also show a form, the control can do a myForm.ShowDialog() for
example to display your MDI parent, but that is the closest to your
requirement that I know of.