I am sure this question must have been handled may times, but I have not found any answer in the forum.

What is the best way to get a platform independent GUI regarding font size, if you have a lack of real estate?
If I design by Windows Designer the Mac GUI will show label and button fonts too big to suit my layout, and vice versa if I design on Mac they will be too small if I view the resulting GUI on Windows.
Also, i.e. Arial 12 does not have the same size, on Windows it is really big, on Mac it is small.
Is there any font that will have a platform independent size?

Any hints for a strategy?
Except having completely different ui files for Mac and Windows, which will be a mess to maintain.

BN