NAV2013R2, arranging ControlAddIns?

Hello!

I've created a ControlAddIn, and created four fields for that, in a CardPart. This CardPart is contained in a RoleCenter. The ControlAddIns are in essense images, which are sized the same as standard NAV tiles (110px,110px).

However, when I open the RoleCenter, the ControlAddIns are arranged like this:

X
X
X
X

and I want it arranged like this:

X X X X

I've tried all kinds of things, like FixedLayout, grouping in columns and so on. But nothing at all seems to change the way it's arranged.

Any ideas?