>Why?
>
>>Try to avoid defining classes in .prg files.

I think more advantage is gained by using the visual interface and keeping code as methods rather than files in a directory. Any number of methods can be accessed with one createobject(). Like you said, it's still a matter of preference but I think the thread on this subject about a week or so ago pointed out many more reasons to use class libraries vs. .prg files for any type class, 'visual' or not. I'll try to find that thread, it was quite lengthy.