If there someone I don't trust, it's a developper :)

Seriously, I would like to develop my control as a black box. It's throwing an error now if an illegal value is assigned (ERROR nErrorNo), so that the developper will notice that he screwed up :) But that work only if he assign a value programatically, not from the property sheet.

I may check the property in the control, but I wanted to avoid this by not accepting invalid values in the first place.

>Well on one hand, it's the developper who's going to put in a value there, so I tend to trust him (which usually means me in my case) to enter a valid value.
>
>On the other hand, you could always add an extra check in the Init method of that object.