Mike, the two are not actually conntected. All you need to do to prevent navigation is handle the NextClicked event on the Wizard Control or the WizardPage (either one depending on your needs) and set the CancelNavigation event arg to True:
Private Sub WizardControl1_NextClicked(ByVal e As NextBackEventArgs) Handles WizardControl1.NextClicked
e.CancelNavigation = True
End Sub