Thanks John for your reply.

I am not an OOP pro (like you) and understand the benefits of
your suggestion.

Creating a hook like you suggested is better design than what I have done
since the textbox now explicitely call my PopList class and set some
of its parameters. You suggested that the PopList class itself should
be doing all the work and I agree.

But should not the textbox behavior be self-contained?

I was trying to make this textbox self-sufficient without having
to call another class. I can actually create the PopList container
and its list from inside the textbox object when the developper put
an SQL statement into its SQLQuery property, but then how do
I make these objects react as I want.

Is there a way to make it so?

I would really appreciate if you could tell me wether this
could be done, or even if it should be done that way in a good
OOP design.

I am still new to OOP and am always looking for improvement
on my OOP design issues.

Thanks in advance

Pascal