Bill-

>Turns out that it's an intermittent problem. I re-booted my computer and it started working fine, but about an hour later I noticed that it wasn't working again. Today right after booting up, the problem appears on the first time I change pages, but if I immediately change pages again it works fine.

Hm.

>As to your idea of putting it inside each control in the container. That's what I ended up doing. I don't think that it's a good solution, but at least it works.

Not sure what you put in inside each control. What I suggested was a way of investigating the problem, not a solution.