In the Init of the form, where the PageFrame is created... after DODEFAULT() of course, you should resize the PageFrame and position it where you want.

All of my objects that are on the form (all 9 of them) are placed on the top of the form. I use the bottom most object to position the pageframe.

The following code would be placed in the init and resize of the form.

with thisform
.Pageframe.Top = .whatever.Top + .whatever.height + 5
.PageFrame.Left = 0
* width must be resized before Height
.PageFrame.width = .width - (.PageFrame.Left * 2) && equal left, right, bottom borders
.Pageframe.Height = .Height - Pageframe.Top - .PageFrame.Left
.PageFrame.Visible = .T.
endwith