Hello Bruno.

I created a pageframe class and named it xpgf. The pageframe has a pagecount of 0
I created a page class and named it xPage

Within init method of a form, I do the following:

thisform.AddObject('PageFrame1','xPgf')
thisform.pageFrame1.AddObject('TestPage1','xPage')
thisform.pageFrame1.AddObject('TestPage2','xPage')
thisform.PageFrame1.Visible=.T.

What happens if you add this line of code:

Thisform.PageFrame1.ActivePage = 1