Setting print margins

I might be missing something but it seems I can’t set print margins on a form.
I use Mac OS X so I go to the page setup and create a custom page format.
Then I go to Servoy and go to the defaultPageFormat property and select my newly created page format.
When I press OK and re-edit the property it is back to my normal setting (A4). So it doesn’t seem to stick.
When I choose any other standard formats (US letter, A5, B5, etc.) it does stick.

Is this a bug or should I set the margins somewhere else?

Servoy Developer
Version R2 2.1.2-build 315
Java version 1.4.2-38 (Mac OS X)