Add Message Box between wizard window

Hi All

I want to know how to add message box between wizard windows

I know the MessageBox MB_YES | MB_NO "message" is used to display the message box.

But wizard window is coming along with them.

So where should i call the MessageBox MB_OK "message" such that only message box appears and depending on the user response we should display the next wizard window

Pages' pre functions, should be used for such operations.