The best way to get the least confusing behavior is to have the
validity checks done when Next is clicked. If the validity checks
fail, display a modal dialog box displaying the error message and
don't transition to the next dialog box in the wizard sequence.
Otherwise, transition to the next dialog in the wizard sequence.
This involves using logic that sets a validation property, i.e.
'valid', when Next is clicked. The modal dialog control event is
conditioned with 'NOT valid' and the transition to the next dialog in
the wizard sequence is conditioned with 'valid'. Make sure that the
first event on your Next button always resets valid to false or true,
as appropriate, otherwise the user can confuse the dialog by
repeatedly clicking Next/Back and changing the data from valid to
invalid or vice-versa.
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