>So the question remains, how has 'subclassing' caused this behaviour, (I have verified that if I use a vfp base class textbox, I have no problem)

Harry
It is interesting. My sub subclassing knowledge leads me to suspect READ EVENTS may have something to do with it. You could develop a find/replace popup that works similar to VFP's find, yet restricted to field objects.

WHAT really interests me, as I learn more and more about how OOP may benefit my production is:
Whats the advantage of subclassing a base class? What I do is float a textbox on the form. If I have other textboxes with similar attributes, I set the general properties and methods that will be shared, then copy and paste and rename, re-top and re-left. Why are you subclassing and could it be helpful to me?

Terry