>I had this working in VFP3 but in VFP5 I can't.
>I thought that returning .F. in the Page.deactivate would prevent the clicked tab page from activating.
>Here's some code
>
>* --- Page1.deactivate ---
>RETURN THIS.PARENT.deactivatePage()
>
>* --- Pageframe.deactivatePage --- (custom method)
>RETURN THISFORM.Save()
>
>
>Now if the user clicks on Page 2's tab and the Save() returns .F. I would expect Page 1 to stay active.
>So I've gone wrong somewhere, 'cause it's not working. Any clues?

Try to issue NODEFAULT Command at the Save Event if condition returns is .F.

IF !RecordSave
NODEFAULT
ENDIF