V.B. code for a back button.

Question

Hi Folks,
Can you help Please.  I am working on MDI forms, with buttons to advance to the next form.  This works ok.  However, I am totally lost on how to code a button the brings you back to the "previous" form. My button can get  the "previous" form, however it always appears as a "New Form".
Any clues to help solve this, will be very much appreciated.
Thanks.