>>Michael,
>>If you based your classes in "relation" you need to change them to "custom".
>>"relation" and some other non-visual classes can't be used in VCXs, as far as I know.
>
>Yes, I found that just after I posted the message. I've been used to use Relation as this is the smallest class. But, when using visual class, we can't. So, I use custom. Is this the smallest one for visual designer?

I have heard discussions about using line or even separator, but then in some you can't add objects that are not "alike".
I use session or relation for prg based classes.
Why are you moving to VCXs?, now I'm rediscovering the joy of working with prg based classes, just one file instead of two, no bloating, less mouse clicks, better/easier internal documentation, etc.
I think that for non-visual classes prgs are the best. For visual classes, then use VCXs.
But I may be wrong... :)