I'm not using subforms the way it's meant to be used. I simply added a subform control to an old application so I could use a listbar on the left of the main window.

That way, clicking the listbar just selects the form to be displayed in the subform.

I'm playing with 2 subforms, making the navigation real quick from one screen (subform) to another only by playing with the "visible" property.

No problem so far.