[Zope] zope product problem

[Dominique Lederer]

> Did you create a new instance before clicking the "properties" tab?
>
> An old instance with a ._question property will not have a .question  
> property, unless you take special pains to update the old instance.

thanks a lot, that helped!

can you explain me in short words, when you use a ._question prop and when  
a .question prop ?
what?s the difference ? i read it has something to do with Acquisition,  
but i didn't understand it.
or maybe a link to a good explanation.

greets HakTom