Change Visible property on subpage from test codeunit

Hi all,

As far as I know and understand, this can't be done this way, but I would like to hear other opinions as well, or suggestion.

I've failed some standard test, because Visible property of some fields on subpage is set to FALSE. I know that we can control Visible property with global variable, but here I don't want to make any changes to standard object. Is there any other way to set visible property to TRUE, from test codeunit or other object, to have successfully passed tests?

Test failed with error:

The field with ID = is not found on the page.

Regards,
Stefan