I have found the property to specify the form to be top level.

To add, the form has no code in the .Init method as the processing is executed via a .timer member object. But the problem is the form passes straight through without waiting for the timer to kick in or allow the user to press the cmdCancel button.

I have the following settings:

oForm.ShowWindow = 2
oForm.WindowType = Modal (which looks like it is overrided by ShowWindow)
_SCREEN.Visible = .f. (in the main.prg)
SCREEN = OFF (in the config.fpw)

And the form is intantiated using oForm.Show(1).