Thanks for replies. When I wrote the message, I've resolved the problem, but the real problem is why I have to do one thing in design time and the same thing, again, in run time?

In this case, how can I be sure about all things projected in design time?
It's frustrating to see how an application well projected goes to hell because update of a control won't fire... Worse, update firest for another control, with other consequencies...