IW 15.1.5.RC7

[Alexandre Machado]

Please check the response for your test case issue in your e-mail. Basically, if you move your Registration callback code from the Form's constructor to the form's OnCreate event it will work. We are changing things so you will be able to run your code as is, but it will take a few days and a new update.
Registering callbacks in form's constructor is kind of common in C++ but extremely rare in Delphi. That's why I guess I never found such a problem in a Delphi project.

Cheers