Hi

You can see the problem only in design mode not at Run-time.

Another strange thing is that if you create the first class with a form and a pageframe with only one page and subclassing it, the page of the pageframe isn't modificable, but this is not true if in the first class you place a pageframe with more than one page.

I noticed that when you want modify the class that subclass the first class, the properties of the pages are re-readed.