>Tore error in this line data type mismatch,
> when i mouse over it. _screen.goSlideshow=".t."
>if not _screen.goSlideshow

Sorry, it should have been

_screen.addproperty('goSlideshow',.T.)

And ,as I wrote in an earlier message; please select "enable auto quote", which one of the options when you hover the mouse over the Message view setup in the upper right corner of the Message viewing area