Resize evenly when resizing form

Resize evenly when resizing form

I have a form (600x500 px). In this form there are 2 groupboxes. The first
one being 260 px and the second one 330 px. What I would like is that when
I resize the form, those two boxes resize with it, but by keeping the
proportions. (the second one bigger then the first). No matter how I set
the Anchor points, I dont seem to be able to do this.