Halt code execution when window open

I need to halt my code when a certain Form is open....

When you show a MsgBox the code execution halts.
I want this to happen with a certain form aswell...when it's closed the code execution should continue.

Form that opens the other form
[Highlight=VB]
Private Sub cmdOpenForm_Click()
MsgBox "Opening...."

Form2.Show vbModal, Me

MsgBox "Closed"
End Sub
[Highlight=VB]

Thanks a lot! Worked fine